diff --git a/.gitea/checker/src/main/java/com/codechecker/CodeCheckMain.java b/.gitea/checker/src/main/java/com/codechecker/CodeCheckMain.java
index d6d149b..5719409 100644
--- a/.gitea/checker/src/main/java/com/codechecker/CodeCheckMain.java
+++ b/.gitea/checker/src/main/java/com/codechecker/CodeCheckMain.java
@@ -3,20 +3,28 @@ package com.codechecker;
 import com.codechecker.analyzer.ClassChangeAnalyzer;
 import com.codechecker.analyzer.EndpointIndexBuilder;
 import com.codechecker.api.analyzer.ApiChangeAnalyzer;
+import com.codechecker.api.analyzer.DtoImpactedApiAnalyzer;
+import com.codechecker.api.model.ApiChangeKind;
 import com.codechecker.api.model.EndpointChangeReport;
 import com.codechecker.api.notify.ApiChangeNotifier;
+import com.codechecker.api.scanner.ApiFileChangeScanner;
 import com.codechecker.config.AppConfig;
 import com.codechecker.git.GitChangeScanner;
 import com.codechecker.model.ApiEndpoint;
 import com.codechecker.model.ClassChangeReport;
+import com.codechecker.notify.OverlapNotificationFilter;
 import com.codechecker.notify.WeComNotifier;
 import picocli.CommandLine;
 import picocli.CommandLine.Command;
 import picocli.CommandLine.Option;
 
 import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.Callable;
 
 /**
@@ -49,7 +57,7 @@ public class CodeCheckMain implements Callable<Integer> {
         System.exit(exitCode);
     }
 
-    /** 主流程：类变更与 API 变更独立检测、分条通知 */
+    /** 主流程：类变更与 API 变更检测，支持 Dto 跟进与重叠通知策略 */
     @Override
     public Integer call() throws Exception {
         AppConfig appConfig = AppConfig.load(config.toAbsolutePath());
@@ -59,27 +67,34 @@ public class CodeCheckMain implements Callable<Integer> {
         }
 
         GitChangeScanner gitScanner = new GitChangeScanner(repoRoot.toAbsolutePath());
-        int totalSent = 0;
+        List<ClassChangeReport> classReports = List.of();
+        List<EndpointChangeReport> apiReports = List.of();
 
         if (appConfig.isClassCheckEnabled()) {
-            totalSent += executeClassCheck(appConfig, gitScanner);
+            classReports = analyzeClassChanges(appConfig, gitScanner);
         } else {
             System.out.println("类变更检测已关闭（class_check.enabled=false）");
         }
 
         if (appConfig.isApiCheckEnabled()) {
-            totalSent += executeApiCheck(appConfig, gitScanner);
+            apiReports = analyzeApiChanges(appConfig, gitScanner, classReports);
         } else {
             System.out.println("API 变更检测已关闭（api_check.enabled=false）");
         }
 
+        OverlapNotificationFilter.FilterResult filtered = OverlapNotificationFilter.apply(
+                classReports, apiReports, appConfig.getDtoOverlapMode());
+        int totalSent = sendClassNotifications(appConfig, filtered.classReports())
+                + sendApiNotifications(appConfig, filtered.apiReports());
+
         if (totalSent == 0 && appConfig.isOnlyOnChange()) {
             System.out.println("无变更，静默退出");
         }
         return 0;
     }
 
-    private int executeClassCheck(AppConfig appConfig, GitChangeScanner gitScanner) throws Exception {
+    private List<ClassChangeReport> analyzeClassChanges(AppConfig appConfig, GitChangeScanner gitScanner)
+            throws Exception {
         System.out.println("=== 类变更检测 ===");
         EndpointIndexBuilder indexBuilder = new EndpointIndexBuilder();
         Map<String, ApiEndpoint> endpointIndex = indexBuilder.buildIndex(repoRoot.toAbsolutePath(), appConfig);
@@ -89,6 +104,55 @@ public class CodeCheckMain implements Callable<Integer> {
         List<ClassChangeReport> reports = analyzer.analyze(
                 repoRoot.toAbsolutePath(), appConfig, oldSha, newSha, endpointIndex);
         System.out.println("检测到需通知的类变更数量: " + reports.size());
+        return reports;
+    }
+
+    private List<EndpointChangeReport> analyzeApiChanges(AppConfig appConfig, GitChangeScanner gitScanner,
+                                                         List<ClassChangeReport> classReports) throws Exception {
+        System.out.println("=== API 变更检测 ===");
+        ApiFileChangeScanner fileScanner = new ApiFileChangeScanner(gitScanner);
+        Set<String> changedApiFiles = new LinkedHashSet<>(fileScanner.scanChangedFiles(
+                repoRoot.toAbsolutePath(), appConfig.getAllApiScanDirs(), oldSha, newSha));
+
+        ApiChangeAnalyzer analyzer = new ApiChangeAnalyzer(gitScanner);
+        List<EndpointChangeReport> reports = new ArrayList<>();
+        if (!changedApiFiles.isEmpty()) {
+            reports.addAll(analyzer.analyze(repoRoot.toAbsolutePath(), appConfig, oldSha, newSha));
+        }
+
+        if (appConfig.isDtoApiFollowUpEnabled() && !classReports.isEmpty()) {
+            DtoImpactedApiAnalyzer dtoAnalyzer = new DtoImpactedApiAnalyzer(gitScanner);
+            List<EndpointChangeReport> followUpReports = dtoAnalyzer.analyze(
+                    repoRoot.toAbsolutePath(), appConfig, oldSha, newSha, classReports, changedApiFiles);
+            if (!followUpReports.isEmpty()) {
+                System.out.println("Dto 跟进检测到 API 参数变更数量: " + followUpReports.size());
+                reports.addAll(followUpReports);
+            }
+        }
+
+        reports = dedupeApiReports(reports);
+        System.out.println("检测到需通知的 API 变更数量: " + reports.size());
+        return reports;
+    }
+
+    private List<EndpointChangeReport> dedupeApiReports(List<EndpointChangeReport> reports) {
+        Map<String, EndpointChangeReport> merged = new LinkedHashMap<>();
+        for (EndpointChangeReport report : reports) {
+            String key = report.getChangeKind() + "|" + report.getHttpMethod() + "|" + report.getUri();
+            EndpointChangeReport existing = merged.get(key);
+            if (existing == null) {
+                merged.put(key, report);
+                continue;
+            }
+            if (report.getChangeKind() == ApiChangeKind.PARAM_CHANGED
+                    && existing.getChangeKind() == ApiChangeKind.PARAM_CHANGED) {
+                report.getParameterChanges().forEach(existing::addParameterChange);
+            }
+        }
+        return new ArrayList<>(merged.values());
+    }
+
+    private int sendClassNotifications(AppConfig appConfig, List<ClassChangeReport> reports) {
         if (reports.isEmpty()) {
             return 0;
         }
@@ -100,12 +164,7 @@ public class CodeCheckMain implements Callable<Integer> {
         return reports.size();
     }
 
-    private int executeApiCheck(AppConfig appConfig, GitChangeScanner gitScanner) throws Exception {
-        System.out.println("=== API 变更检测 ===");
-        ApiChangeAnalyzer analyzer = new ApiChangeAnalyzer(gitScanner);
-        List<EndpointChangeReport> reports = analyzer.analyze(
-                repoRoot.toAbsolutePath(), appConfig, oldSha, newSha);
-        System.out.println("检测到需通知的 API 变更数量: " + reports.size());
+    private int sendApiNotifications(AppConfig appConfig, List<EndpointChangeReport> reports) {
         if (reports.isEmpty()) {
             return 0;
         }
diff --git a/.gitea/checker/src/main/java/com/codechecker/api/analyzer/ApiChangeAnalyzer.java b/.gitea/checker/src/main/java/com/codechecker/api/analyzer/ApiChangeAnalyzer.java
index c5c0a6c..376539f 100644
--- a/.gitea/checker/src/main/java/com/codechecker/api/analyzer/ApiChangeAnalyzer.java
+++ b/.gitea/checker/src/main/java/com/codechecker/api/analyzer/ApiChangeAnalyzer.java
@@ -34,7 +34,7 @@ public class ApiChangeAnalyzer {
 
         EndpointSnapshotParser parser = new EndpointSnapshotParser(config.isApiExcludeFrameworkParams());
         ParameterDiffEngine parameterDiffEngine = new ParameterDiffEngine(
-                repoRoot, buildSearchDirs(config));
+                repoRoot, buildSearchDirs(config), gitScanner, oldSha, newSha);
         EndpointDiffEngine endpointDiffEngine = new EndpointDiffEngine(parameterDiffEngine);
 
         List<EndpointSnapshot> oldSnapshots = new ArrayList<>();
diff --git a/.gitea/checker/src/main/java/com/codechecker/api/analyzer/DtoImpactedApiAnalyzer.java b/.gitea/checker/src/main/java/com/codechecker/api/analyzer/DtoImpactedApiAnalyzer.java
new file mode 100644
index 0000000..68225e5
--- /dev/null
+++ b/.gitea/checker/src/main/java/com/codechecker/api/analyzer/DtoImpactedApiAnalyzer.java
@@ -0,0 +1,133 @@
+package com.codechecker.api.analyzer;
+
+import com.codechecker.api.model.ApiChangeKind;
+import com.codechecker.api.model.EndpointChangeReport;
+import com.codechecker.api.model.EndpointSnapshot;
+import com.codechecker.api.model.ParameterChange;
+import com.codechecker.api.parser.EndpointSnapshotParser;
+import com.codechecker.config.AppConfig;
+import com.codechecker.git.GitChangeScanner;
+import com.codechecker.model.ApiEndpoint;
+import com.codechecker.model.ClassChangeReport;
+import com.codechecker.model.ClassType;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * 类变更（Dto 字段）后，对受影响的 Controller 继续 API 参数 diff，产出 PARAM_CHANGED 报告。
+ */
+public class DtoImpactedApiAnalyzer {
+    private final GitChangeScanner gitScanner;
+
+    public DtoImpactedApiAnalyzer(GitChangeScanner gitScanner) {
+        this.gitScanner = gitScanner;
+    }
+
+    public List<EndpointChangeReport> analyze(Path repoRoot, AppConfig config,
+                                              String oldSha, String newSha,
+                                              List<ClassChangeReport> classReports,
+                                              Set<String> alreadyScannedFiles) throws IOException {
+        Map<String, Set<String>> controllerToDtos = collectImpactedControllers(classReports, alreadyScannedFiles);
+        if (controllerToDtos.isEmpty()) {
+            return List.of();
+        }
+
+        EndpointSnapshotParser parser = new EndpointSnapshotParser(config.isApiExcludeFrameworkParams());
+        ParameterDiffEngine parameterDiffEngine = new ParameterDiffEngine(
+                repoRoot, buildSearchDirs(config), gitScanner, oldSha, newSha);
+        EndpointDiffEngine endpointDiffEngine = new EndpointDiffEngine(parameterDiffEngine);
+
+        List<EndpointSnapshot> oldSnapshots = new ArrayList<>();
+        List<EndpointSnapshot> newSnapshots = new ArrayList<>();
+        for (String path : controllerToDtos.keySet()) {
+            boolean feign = isFeignPath(path, config);
+            String oldSource = gitScanner.readFileAtCommit(oldSha, path);
+            String newSource = gitScanner.readFileAtCommit(newSha, path);
+            oldSnapshots.addAll(parser.parseSource(oldSource, path, feign));
+            newSnapshots.addAll(parser.parseSource(newSource, path, feign));
+        }
+
+        List<EndpointChangeReport> reports = new ArrayList<>();
+        for (EndpointChangeReport report : endpointDiffEngine.diff(oldSnapshots, newSnapshots)) {
+            if (report.getChangeKind() != ApiChangeKind.PARAM_CHANGED || !report.hasParameterChanges()) {
+                continue;
+            }
+            String relatedDto = findRelatedDto(report, controllerToDtos);
+            if (relatedDto == null) {
+                continue;
+            }
+            reports.add(EndpointChangeReport.dtoFollowUp(report, relatedDto));
+        }
+        return reports;
+    }
+
+    private Map<String, Set<String>> collectImpactedControllers(List<ClassChangeReport> classReports,
+                                                                Set<String> alreadyScannedFiles) {
+        Map<String, Set<String>> controllerToDtos = new LinkedHashMap<>();
+        for (ClassChangeReport report : classReports) {
+            if (report.getClassType() != ClassType.DTO || report.getFieldChanges().isEmpty()) {
+                continue;
+            }
+            Set<String> dtoNames = dtoNames(report);
+            for (ApiEndpoint endpoint : report.getInputImpactEndpoints()) {
+                String controllerFile = endpoint.getSourceFile();
+                if (alreadyScannedFiles.contains(controllerFile)) {
+                    continue;
+                }
+                controllerToDtos.computeIfAbsent(controllerFile, k -> new LinkedHashSet<>()).addAll(dtoNames);
+            }
+        }
+        return controllerToDtos;
+    }
+
+    private String findRelatedDto(EndpointChangeReport report, Map<String, Set<String>> controllerToDtos) {
+        Set<String> impactedDtos = controllerToDtos.getOrDefault(report.getSourceFile(), Set.of());
+        for (ParameterChange change : report.getParameterChanges()) {
+            if (!"body".equals(change.getSource())) {
+                continue;
+            }
+            String parentDto = change.getParentDto();
+            if (parentDto != null && impactedDtos.contains(parentDto)) {
+                return parentDto;
+            }
+        }
+        return null;
+    }
+
+    private Set<String> dtoNames(ClassChangeReport report) {
+        Set<String> names = new LinkedHashSet<>();
+        names.add(report.getClassName());
+        if (report.getOldClassName() != null && !report.getOldClassName().isBlank()) {
+            names.add(report.getOldClassName());
+        }
+        return names;
+    }
+
+    private List<String> buildSearchDirs(AppConfig config) {
+        List<String> dirs = new ArrayList<>();
+        dirs.addAll(config.getModelDirs());
+        dirs.addAll(config.getAllApiScanDirs());
+        return dirs;
+    }
+
+    private boolean isFeignPath(String path, AppConfig config) {
+        String normalized = path.replace('\\', '/');
+        for (String dir : config.getApiFeignScanDirs()) {
+            String prefix = dir.replace('\\', '/');
+            if (!prefix.endsWith("/")) {
+                prefix = prefix + "/";
+            }
+            if (normalized.startsWith(prefix)) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
diff --git a/.gitea/checker/src/main/java/com/codechecker/api/analyzer/ParameterDiffEngine.java b/.gitea/checker/src/main/java/com/codechecker/api/analyzer/ParameterDiffEngine.java
index f880d94..1a789e2 100644
--- a/.gitea/checker/src/main/java/com/codechecker/api/analyzer/ParameterDiffEngine.java
+++ b/.gitea/checker/src/main/java/com/codechecker/api/analyzer/ParameterDiffEngine.java
@@ -6,6 +6,7 @@ import com.codechecker.api.model.MethodParameterSnapshot;
 import com.codechecker.api.model.ParameterChange;
 import com.codechecker.api.parser.NestedDtoFieldParser;
 import com.codechecker.api.parser.NestedFieldInfo;
+import com.codechecker.git.GitChangeScanner;
 import com.codechecker.model.FieldChange;
 import com.codechecker.model.FieldInfo;
 
@@ -31,8 +32,9 @@ public class ParameterDiffEngine {
     private final NestedDtoFieldParser nestedDtoFieldParser;
     private final FieldDiffEngine fieldDiffEngine = new FieldDiffEngine();
 
-    public ParameterDiffEngine(Path repoRoot, List<String> searchDirs) {
-        this.nestedDtoFieldParser = new NestedDtoFieldParser(repoRoot, searchDirs);
+    public ParameterDiffEngine(Path repoRoot, List<String> searchDirs,
+                               GitChangeScanner gitScanner, String oldSha, String newSha) {
+        this.nestedDtoFieldParser = new NestedDtoFieldParser(repoRoot, searchDirs, gitScanner, oldSha, newSha);
     }
 
     public List<ParameterChange> diff(EndpointSnapshot oldSnap, EndpointSnapshot newSnap) throws IOException {
@@ -175,8 +177,8 @@ public class ParameterDiffEngine {
 
     private List<ParameterChange> diffBodyDto(MethodParameterSnapshot oldParam,
                                                 MethodParameterSnapshot newParam) throws IOException {
-        List<NestedFieldInfo> oldFields = nestedDtoFieldParser.parseNestedFields(oldParam.getDtoClassName());
-        List<NestedFieldInfo> newFields = nestedDtoFieldParser.parseNestedFields(newParam.getDtoClassName());
+        List<NestedFieldInfo> oldFields = nestedDtoFieldParser.parseNestedFieldsAtOldCommit(oldParam.getDtoClassName());
+        List<NestedFieldInfo> newFields = nestedDtoFieldParser.parseNestedFieldsAtNewCommit(newParam.getDtoClassName());
         List<FieldChange> fieldChanges = fieldDiffEngine.diff(toFieldInfo(oldFields), toFieldInfo(newFields));
         List<ParameterChange> result = new ArrayList<>();
         for (FieldChange fc : fieldChanges) {
@@ -206,7 +208,7 @@ public class ParameterDiffEngine {
 
     private List<ParameterChange> addedBodyChanges(MethodParameterSnapshot param) throws IOException {
         List<ParameterChange> list = new ArrayList<>();
-        for (NestedFieldInfo field : nestedDtoFieldParser.parseNestedFields(param.getDtoClassName())) {
+        for (NestedFieldInfo field : nestedDtoFieldParser.parseNestedFieldsAtNewCommit(param.getDtoClassName())) {
             list.add(ParameterChange.added(field.getPath(), field.getType(), field.getDescription(),
                     "body", param.getName(), param.getDtoClassName(), field.getPath()));
         }
@@ -215,7 +217,7 @@ public class ParameterDiffEngine {
 
     private List<ParameterChange> removedBodyChanges(MethodParameterSnapshot param) throws IOException {
         List<ParameterChange> list = new ArrayList<>();
-        for (NestedFieldInfo field : nestedDtoFieldParser.parseNestedFields(param.getDtoClassName())) {
+        for (NestedFieldInfo field : nestedDtoFieldParser.parseNestedFieldsAtOldCommit(param.getDtoClassName())) {
             list.add(ParameterChange.removed(field.getPath(), field.getType(), field.getDescription(),
                     "body", param.getName(), param.getDtoClassName(), field.getPath()));
         }
diff --git a/.gitea/checker/src/main/java/com/codechecker/api/model/EndpointChangeReport.java b/.gitea/checker/src/main/java/com/codechecker/api/model/EndpointChangeReport.java
index d414c0c..3765c28 100644
--- a/.gitea/checker/src/main/java/com/codechecker/api/model/EndpointChangeReport.java
+++ b/.gitea/checker/src/main/java/com/codechecker/api/model/EndpointChangeReport.java
@@ -15,11 +15,20 @@ public class EndpointChangeReport {
     private final String sourceFile;
     private final String controllerClass;
     private final String endpointDescription;
+    private final boolean dtoFollowUp;
+    private final String relatedDtoClassName;
     private final List<ParameterChange> parameterChanges = new ArrayList<>();
 
     public EndpointChangeReport(ApiChangeKind changeKind, String httpMethod, String oldHttpMethod,
                                 String uri, String oldUri, String sourceFile, String controllerClass,
                                 String endpointDescription) {
+        this(changeKind, httpMethod, oldHttpMethod, uri, oldUri, sourceFile, controllerClass,
+                endpointDescription, false, null);
+    }
+
+    public EndpointChangeReport(ApiChangeKind changeKind, String httpMethod, String oldHttpMethod,
+                                String uri, String oldUri, String sourceFile, String controllerClass,
+                                String endpointDescription, boolean dtoFollowUp, String relatedDtoClassName) {
         this.changeKind = changeKind;
         this.httpMethod = httpMethod;
         this.oldHttpMethod = oldHttpMethod;
@@ -28,6 +37,25 @@ public class EndpointChangeReport {
         this.sourceFile = sourceFile;
         this.controllerClass = controllerClass;
         this.endpointDescription = endpointDescription == null ? "" : endpointDescription;
+        this.dtoFollowUp = dtoFollowUp;
+        this.relatedDtoClassName = relatedDtoClassName;
+    }
+
+    /** 基于已有报告创建 Dto 跟进产生的副本 */
+    public static EndpointChangeReport dtoFollowUp(EndpointChangeReport source, String relatedDtoClassName) {
+        EndpointChangeReport copy = new EndpointChangeReport(
+                source.getChangeKind(),
+                source.getHttpMethod(),
+                source.getOldHttpMethod(),
+                source.getUri(),
+                source.getOldUri(),
+                source.getSourceFile(),
+                source.getControllerClass(),
+                source.getEndpointDescription(),
+                true,
+                relatedDtoClassName);
+        source.getParameterChanges().forEach(copy::addParameterChange);
+        return copy;
     }
 
     public ApiChangeKind getChangeKind() {
@@ -73,4 +101,12 @@ public class EndpointChangeReport {
     public boolean hasParameterChanges() {
         return !parameterChanges.isEmpty();
     }
+
+    public boolean isDtoFollowUp() {
+        return dtoFollowUp;
+    }
+
+    public String getRelatedDtoClassName() {
+        return relatedDtoClassName;
+    }
 }
diff --git a/.gitea/checker/src/main/java/com/codechecker/api/parser/JavaSourceLocator.java b/.gitea/checker/src/main/java/com/codechecker/api/parser/JavaSourceLocator.java
index e119909..80cf6bc 100644
--- a/.gitea/checker/src/main/java/com/codechecker/api/parser/JavaSourceLocator.java
+++ b/.gitea/checker/src/main/java/com/codechecker/api/parser/JavaSourceLocator.java
@@ -1,5 +1,7 @@
 package com.codechecker.api.parser;
 
+import com.codechecker.git.GitChangeScanner;
+
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -27,6 +29,24 @@ public class JavaSourceLocator {
         return Optional.of(Files.readString(path.get()));
     }
 
+    public Optional<String> readSourceAtCommit(GitChangeScanner gitScanner, String sha,
+                                               String simpleClassName) throws IOException {
+        Optional<String> relativePath = findRelativePath(simpleClassName);
+        if (relativePath.isEmpty()) {
+            return Optional.empty();
+        }
+        String source = gitScanner.readFileAtCommit(sha, relativePath.get());
+        if (source == null || source.isBlank()) {
+            return Optional.empty();
+        }
+        return Optional.of(source);
+    }
+
+    public Optional<String> findRelativePath(String simpleClassName) throws IOException {
+        Optional<Path> path = findFile(simpleClassName);
+        return path.map(p -> repoRoot.relativize(p).toString().replace('\\', '/'));
+    }
+
     public Optional<Path> findFile(String simpleClassName) throws IOException {
         String fileName = simpleClassName + ".java";
         for (String dir : searchDirs) {
diff --git a/.gitea/checker/src/main/java/com/codechecker/api/parser/NestedDtoFieldParser.java b/.gitea/checker/src/main/java/com/codechecker/api/parser/NestedDtoFieldParser.java
index 53e8d30..847a6d2 100644
--- a/.gitea/checker/src/main/java/com/codechecker/api/parser/NestedDtoFieldParser.java
+++ b/.gitea/checker/src/main/java/com/codechecker/api/parser/NestedDtoFieldParser.java
@@ -1,5 +1,6 @@
 package com.codechecker.api.parser;
 
+import com.codechecker.git.GitChangeScanner;
 import com.codechecker.model.FieldInfo;
 import com.codechecker.parser.ClassFieldParser;
 import com.codechecker.parser.TypeNameUtils;
@@ -25,25 +26,40 @@ public class NestedDtoFieldParser {
 
     private final ClassFieldParser classFieldParser = new ClassFieldParser();
     private final JavaSourceLocator sourceLocator;
+    private final GitChangeScanner gitScanner;
+    private final String oldSha;
+    private final String newSha;
 
-    public NestedDtoFieldParser(Path repoRoot, List<String> searchDirs) {
+    public NestedDtoFieldParser(Path repoRoot, List<String> searchDirs,
+                                GitChangeScanner gitScanner, String oldSha, String newSha) {
         this.sourceLocator = new JavaSourceLocator(repoRoot, searchDirs);
+        this.gitScanner = gitScanner;
+        this.oldSha = oldSha;
+        this.newSha = newSha;
     }
 
-    public List<NestedFieldInfo> parseNestedFields(String dtoClassName) throws IOException {
+    public List<NestedFieldInfo> parseNestedFieldsAtOldCommit(String dtoClassName) throws IOException {
+        return parseNestedFields(dtoClassName, oldSha);
+    }
+
+    public List<NestedFieldInfo> parseNestedFieldsAtNewCommit(String dtoClassName) throws IOException {
+        return parseNestedFields(dtoClassName, newSha);
+    }
+
+    private List<NestedFieldInfo> parseNestedFields(String dtoClassName, String sha) throws IOException {
         Set<String> visiting = new HashSet<>();
         List<NestedFieldInfo> result = new ArrayList<>();
-        collectFields(dtoClassName, "", visiting, result);
+        collectFields(dtoClassName, "", visiting, result, sha);
         return result;
     }
 
     private void collectFields(String className, String prefix, Set<String> visiting,
-                               List<NestedFieldInfo> out) throws IOException {
+                               List<NestedFieldInfo> out, String sha) throws IOException {
         if (className == null || className.isBlank() || visiting.contains(className)) {
             return;
         }
         visiting.add(className);
-        Optional<String> source = sourceLocator.readSourceBySimpleName(className);
+        Optional<String> source = readSource(className, sha);
         if (source.isEmpty()) {
             visiting.remove(className);
             return;
@@ -56,12 +72,19 @@ public class NestedDtoFieldParser {
                 out.add(new NestedFieldInfo(path, field.getType(), field.getDescription()));
             } else {
                 out.add(new NestedFieldInfo(path, field.getType(), field.getDescription()));
-                collectFields(simpleType, path, visiting, out);
+                collectFields(simpleType, path, visiting, out, sha);
             }
         }
         visiting.remove(className);
     }
 
+    private Optional<String> readSource(String className, String sha) throws IOException {
+        if (sha != null && gitScanner != null) {
+            return sourceLocator.readSourceAtCommit(gitScanner, sha, className);
+        }
+        return sourceLocator.readSourceBySimpleName(className);
+    }
+
     private boolean isLeafType(String simpleType) {
         return LEAF_TYPES.contains(simpleType) || simpleType.endsWith("[]");
     }
diff --git a/.gitea/checker/src/main/java/com/codechecker/config/AppConfig.java b/.gitea/checker/src/main/java/com/codechecker/config/AppConfig.java
index 927deaf..caf5936 100644
--- a/.gitea/checker/src/main/java/com/codechecker/config/AppConfig.java
+++ b/.gitea/checker/src/main/java/com/codechecker/config/AppConfig.java
@@ -25,10 +25,12 @@ public class AppConfig {
     private boolean wecomEnabled = true;
     private boolean onlyOnChange = true;
 
+    private boolean dtoApiFollowUpEnabled = true;
     private boolean apiCheckEnabled = true;
     private boolean apiExcludeFrameworkParams = true;
     private List<String> apiControllerScanDirs = new ArrayList<>();
     private List<String> apiFeignScanDirs = new ArrayList<>();
+    private DtoOverlapMode dtoOverlapMode = DtoOverlapMode.BOTH;
 
     /** 从 YAML 文件加载配置 */
     @SuppressWarnings("unchecked")
@@ -49,6 +51,9 @@ public class AppConfig {
         Map<String, Object> classCheck = mapOrEmpty(root.get("class_check"));
         config.classCheckEnabled = boolOrDefault(classCheck.get("enabled"), true);
 
+        Map<String, Object> dtoApiFollowUp = mapOrEmpty(classCheck.get("dto_api_follow_up"));
+        config.dtoApiFollowUpEnabled = boolOrDefault(dtoApiFollowUp.get("enabled"), true);
+
         Map<String, Object> conversion = mapOrEmpty(classCheck.get("dto_entity_conversion"));
         config.dtoEntityConversionEnabled = boolOrDefault(conversion.get("enabled"), true);
 
@@ -64,6 +69,7 @@ public class AppConfig {
 
         Map<String, Object> notify = mapOrEmpty(root.get("notify"));
         config.onlyOnChange = boolOrDefault(notify.get("only_on_change"), true);
+        config.dtoOverlapMode = DtoOverlapMode.fromString(stringOrEmpty(notify.get("dto_overlap_mode")));
 
         Map<String, Object> apiCheck = mapOrEmpty(root.get("api_check"));
         config.apiCheckEnabled = boolOrDefault(apiCheck.get("enabled"), true);
@@ -169,11 +175,21 @@ public class AppConfig {
         return onlyOnChange;
     }
 
+    /** Dto 类变更后是否继续检测受影响接口的 API 参数变更 */
+    public boolean isDtoApiFollowUpEnabled() {
+        return dtoApiFollowUpEnabled;
+    }
+
     /** API 变更检测总开关 */
     public boolean isApiCheckEnabled() {
         return apiCheckEnabled;
     }
 
+    /** Dto 类变更与 API 参数变更重叠时的通知策略 */
+    public DtoOverlapMode getDtoOverlapMode() {
+        return dtoOverlapMode;
+    }
+
     /** 是否排除 Spring 框架注入参数 */
     public boolean isApiExcludeFrameworkParams() {
         return apiExcludeFrameworkParams;
diff --git a/.gitea/checker/src/main/java/com/codechecker/config/DtoOverlapMode.java b/.gitea/checker/src/main/java/com/codechecker/config/DtoOverlapMode.java
new file mode 100644
index 0000000..a62d1bb
--- /dev/null
+++ b/.gitea/checker/src/main/java/com/codechecker/config/DtoOverlapMode.java
@@ -0,0 +1,24 @@
+package com.codechecker.config;
+
+/**
+ * Dto 类变更与 API 参数变更重叠时的通知策略。
+ */
+public enum DtoOverlapMode {
+    /** 仅发类变更通知，抑制重叠的 API 参数通知 */
+    CLASS_ONLY,
+    /** 仅发 API 参数通知，抑制重叠的类变更通知 */
+    API_ONLY,
+    /** 两类通知均发送 */
+    BOTH;
+
+    public static DtoOverlapMode fromString(String value) {
+        if (value == null || value.isBlank()) {
+            return BOTH;
+        }
+        try {
+            return DtoOverlapMode.valueOf(value.trim().toUpperCase());
+        } catch (IllegalArgumentException ex) {
+            return BOTH;
+        }
+    }
+}
diff --git a/.gitea/checker/src/main/java/com/codechecker/notify/OverlapNotificationFilter.java b/.gitea/checker/src/main/java/com/codechecker/notify/OverlapNotificationFilter.java
new file mode 100644
index 0000000..28bd146
--- /dev/null
+++ b/.gitea/checker/src/main/java/com/codechecker/notify/OverlapNotificationFilter.java
@@ -0,0 +1,203 @@
+package com.codechecker.notify;
+
+import com.codechecker.api.model.ApiChangeKind;
+import com.codechecker.api.model.EndpointChangeReport;
+import com.codechecker.api.model.ParameterChange;
+import com.codechecker.config.DtoOverlapMode;
+import com.codechecker.model.ApiEndpoint;
+import com.codechecker.model.ClassChangeReport;
+import com.codechecker.model.ClassType;
+
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * 按配置过滤 Dto 类变更与 API 参数变更的重叠通知。
+ */
+public class OverlapNotificationFilter {
+
+    public static final class FilterResult {
+        private final List<ClassChangeReport> classReports;
+        private final List<EndpointChangeReport> apiReports;
+
+        public FilterResult(List<ClassChangeReport> classReports, List<EndpointChangeReport> apiReports) {
+            this.classReports = classReports;
+            this.apiReports = apiReports;
+        }
+
+        public List<ClassChangeReport> classReports() {
+            return classReports;
+        }
+
+        public List<EndpointChangeReport> apiReports() {
+            return apiReports;
+        }
+    }
+
+    public static FilterResult apply(List<ClassChangeReport> classReports,
+                                     List<EndpointChangeReport> apiReports,
+                                     DtoOverlapMode mode) {
+        if (mode == DtoOverlapMode.BOTH) {
+            return new FilterResult(classReports, apiReports);
+        }
+        Set<OverlapKey> overlapKeys = buildOverlapKeys(classReports);
+        if (overlapKeys.isEmpty()) {
+            return new FilterResult(classReports, apiReports);
+        }
+        if (mode == DtoOverlapMode.CLASS_ONLY) {
+            return new FilterResult(classReports, filterApiReports(apiReports, overlapKeys));
+        }
+        Set<OverlapKey> apiOverlapKeys = buildApiOverlapKeys(apiReports);
+        return new FilterResult(filterClassReportsForApiOnly(classReports, apiOverlapKeys), apiReports);
+    }
+
+    private static Set<OverlapKey> buildOverlapKeys(List<ClassChangeReport> classReports) {
+        Set<OverlapKey> keys = new LinkedHashSet<>();
+        for (ClassChangeReport report : classReports) {
+            if (report.getClassType() != ClassType.DTO) {
+                continue;
+            }
+            if (!hasDtoFieldChanges(report)) {
+                continue;
+            }
+            Set<String> dtoNames = dtoNames(report);
+            for (ApiEndpoint endpoint : report.getInputImpactEndpoints()) {
+                for (String dtoName : dtoNames) {
+                    keys.add(new OverlapKey(dtoName, endpoint.endpointKey()));
+                }
+            }
+        }
+        return keys;
+    }
+
+    private static List<EndpointChangeReport> filterApiReports(List<EndpointChangeReport> apiReports,
+                                                               Set<OverlapKey> overlapKeys) {
+        List<EndpointChangeReport> kept = new ArrayList<>();
+        for (EndpointChangeReport report : apiReports) {
+            if (!matchesOverlap(report, overlapKeys)) {
+                kept.add(report);
+            }
+        }
+        return kept;
+    }
+
+    private static List<ClassChangeReport> filterClassReportsForApiOnly(List<ClassChangeReport> classReports,
+                                                                        Set<OverlapKey> apiOverlapKeys) {
+        List<ClassChangeReport> kept = new ArrayList<>();
+        for (ClassChangeReport report : classReports) {
+            if (!shouldSuppressClassForApiOnly(report, apiOverlapKeys)) {
+                kept.add(report);
+            }
+        }
+        return kept;
+    }
+
+    private static Set<OverlapKey> buildApiOverlapKeys(List<EndpointChangeReport> apiReports) {
+        Set<OverlapKey> keys = new LinkedHashSet<>();
+        for (EndpointChangeReport report : apiReports) {
+            if (report.getChangeKind() != ApiChangeKind.PARAM_CHANGED) {
+                continue;
+            }
+            String endpointKey = report.getHttpMethod() + " " + report.getUri();
+            for (ParameterChange change : report.getParameterChanges()) {
+                if (!"body".equals(change.getSource())) {
+                    continue;
+                }
+                String parentDto = change.getParentDto();
+                if (parentDto != null && !parentDto.isBlank()) {
+                    keys.add(new OverlapKey(parentDto, endpointKey));
+                }
+            }
+            if (report.isDtoFollowUp()) {
+                String relatedDto = report.getRelatedDtoClassName();
+                if (relatedDto != null && !relatedDto.isBlank()) {
+                    keys.add(new OverlapKey(relatedDto, endpointKey));
+                }
+            }
+        }
+        return keys;
+    }
+
+    private static boolean shouldSuppressClassForApiOnly(ClassChangeReport report,
+                                                         Set<OverlapKey> apiOverlapKeys) {
+        if (report.getClassType() != ClassType.DTO || !hasDtoFieldChanges(report)) {
+            return false;
+        }
+        for (ApiEndpoint endpoint : report.getInputImpactEndpoints()) {
+            for (String dtoName : dtoNames(report)) {
+                if (apiOverlapKeys.contains(new OverlapKey(dtoName, endpoint.endpointKey()))) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    private static boolean matchesOverlap(EndpointChangeReport report, Set<OverlapKey> overlapKeys) {
+        if (report.getChangeKind() != ApiChangeKind.PARAM_CHANGED) {
+            return false;
+        }
+        String endpointKey = report.getHttpMethod() + " " + report.getUri();
+        for (ParameterChange change : report.getParameterChanges()) {
+            if (!"body".equals(change.getSource())) {
+                continue;
+            }
+            String parentDto = change.getParentDto();
+            if (parentDto == null || parentDto.isBlank()) {
+                continue;
+            }
+            if (overlapKeys.contains(new OverlapKey(parentDto, endpointKey))) {
+                return true;
+            }
+        }
+        if (report.isDtoFollowUp()) {
+            String relatedDto = report.getRelatedDtoClassName();
+            if (relatedDto != null && overlapKeys.contains(new OverlapKey(relatedDto, endpointKey))) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static boolean hasDtoFieldChanges(ClassChangeReport report) {
+        return !report.getFieldChanges().isEmpty();
+    }
+
+    private static Set<String> dtoNames(ClassChangeReport report) {
+        Set<String> names = new LinkedHashSet<>();
+        names.add(report.getClassName());
+        if (report.getOldClassName() != null && !report.getOldClassName().isBlank()) {
+            names.add(report.getOldClassName());
+        }
+        return names;
+    }
+
+    private static final class OverlapKey {
+        private final String dtoClassName;
+        private final String endpointKey;
+
+        private OverlapKey(String dtoClassName, String endpointKey) {
+            this.dtoClassName = dtoClassName;
+            this.endpointKey = endpointKey;
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            if (!(obj instanceof OverlapKey)) {
+                return false;
+            }
+            OverlapKey other = (OverlapKey) obj;
+            return dtoClassName.equals(other.dtoClassName) && endpointKey.equals(other.endpointKey);
+        }
+
+        @Override
+        public int hashCode() {
+            return dtoClassName.hashCode() * 31 + endpointKey.hashCode();
+        }
+    }
+}