diff --git a/apps/web/app/versions/[id]/page.tsx b/apps/web/app/versions/[id]/page.tsx
index b51e332..c8dcbcb 100644
--- a/apps/web/app/versions/[id]/page.tsx
+++ b/apps/web/app/versions/[id]/page.tsx
@@ -303,27 +303,33 @@ export default function VersionDetailPage() {
 
                   const calcGroupProgress = (group: typeof vPlans, type: 'research' | 'product' | 'ui') => {
                     if (group.length === 0) return 0;
-                    // 每个 plan 按权重贡献进度：completed=1, in_progress=子任务完成率, pending=0
-                    let totalWeight = 0;
+                    // 分子=已完成子任务数，分母=所有plan的子任务总数
+                    // completed 的 plan：其子任务全算已完成
+                    let totalItems = 0;
+                    let doneItems = 0;
                     for (const p of group) {
-                      if (p.status === 'completed') {
-                        totalWeight += 1;
-                      } else if (p.status === 'in_progress') {
-                        if (type === 'research') {
-                          const tasks = p.tasks || [];
-                          if (tasks.length > 0) {
-                            totalWeight += tasks.filter((t) => t.status === 'completed').length / tasks.length;
-                          }
+                      if (type === 'research') {
+                        const tasks = p.tasks || [];
+                        const count = Math.max(tasks.length, 1);
+                        totalItems += count;
+                        if (p.status === 'completed') {
+                          doneItems += count;
+                        } else {
+                          doneItems += tasks.filter((t) => t.status === 'completed').length;
+                        }
+                      } else {
+                        const linked = p.linkedRequirementIds || [];
+                        const count = Math.max(linked.length, 1);
+                        totalItems += count;
+                        if (p.status === 'completed') {
+                          doneItems += count;
                         } else {
-                          const linked = p.linkedRequirementIds || [];
                           const completed = p.completedRequirementIds || [];
-                          if (linked.length > 0) {
-                            totalWeight += completed.filter((id) => linked.includes(id)).length / linked.length;
-                          }
+                          doneItems += completed.filter((id) => linked.includes(id)).length;
                         }
                       }
                     }
-                    return Math.round((totalWeight / group.length) * 100);
+                    return totalItems > 0 ? Math.round((doneItems / totalItems) * 100) : 0;
                   };
 
                   const getPlanStatus = (group: typeof vPlans): 'idle' | 'active' | 'done' => {
diff --git a/apps/web/components/version/PlanTab.tsx b/apps/web/components/version/PlanTab.tsx
index 9a9ad2b..17c3d62 100644
--- a/apps/web/components/version/PlanTab.tsx
+++ b/apps/web/components/version/PlanTab.tsx
@@ -252,6 +252,7 @@ function PlanFormModal({ initial, planType, versionId, versionDeadline, currentU
     e.preventDefault();
     if (!title.trim() || !endTime) return;
     if (isOverdue && !overdueReason.trim()) return;
+    if (planType === 'research' && tasks.length === 0) return;
     onSubmit({
       versionId,
       type: planType,
@@ -326,7 +327,25 @@ function PlanFormModal({ initial, planType, versionId, versionDeadline, currentU
           )}
           {planType === 'research' && (
           <div>
-            <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1.5 block">任务清单</label>
+            <label className="text-[12px] font-medium text-[var(--ink-soft)] mb-1.5 block">
+              任务清单 <span className="text-red-500">*</span>
+              <span className="text-[10px] text-[var(--ink-muted)] ml-1">至少添加一项</span>
+            </label>
+            {/* 预设选项 */}
+            {tasks.length === 0 && (
+              <div className="flex flex-wrap gap-1.5 mb-2">
+                {['竞品分析', '用户访谈', '数据调研', '技术可行性分析', '市场调研', '需求分析'].map((preset) => (
+                  <button
+                    key={preset}
+                    type="button"
+                    onClick={() => setTasks([...tasks, { id: `task-${Date.now()}-${Math.random().toString(36).slice(2, 5)}`, title: preset, status: 'pending' }])}
+                    className="h-6 px-2.5 rounded-md text-[11px] border border-dashed border-[var(--line)] text-[var(--ink-soft)] hover:border-[var(--accent)] hover:text-[var(--accent)] transition-colors"
+                  >
+                    + {preset}
+                  </button>
+                ))}
+              </div>
+            )}
             <div className="space-y-1.5 mb-2">
               {tasks.map((task, i) => (
                 <div key={task.id} className="flex items-center gap-2 rounded-lg bg-[var(--bg-subtle)] px-3 py-1.5">
@@ -340,11 +359,14 @@ function PlanFormModal({ initial, planType, versionId, versionDeadline, currentU
                 value={newTaskTitle}
                 onChange={(e) => setNewTaskTitle(e.target.value)}
                 onKeyDown={(e) => { if (e.key === 'Enter') { e.preventDefault(); if (newTaskTitle.trim()) { setTasks([...tasks, { id: `task-${Date.now()}`, title: newTaskTitle.trim(), status: 'pending' }]); setNewTaskTitle(''); } } }}
-                placeholder="输入任务名称，回车添加"
+                placeholder="自定义任务名称，回车添加"
                 className="flex-1 h-8 rounded-lg border border-[var(--line)] bg-[var(--bg-card)] px-3 text-[12px] focus:border-[var(--accent)] focus:outline-none"
               />
               <button type="button" onClick={() => { if (newTaskTitle.trim()) { setTasks([...tasks, { id: `task-${Date.now()}`, title: newTaskTitle.trim(), status: 'pending' }]); setNewTaskTitle(''); } }} className="h-8 px-3 rounded-lg text-[12px] font-medium bg-[var(--bg-subtle)] text-[var(--ink-soft)] hover:bg-[var(--line)]">添加</button>
             </div>
+            {tasks.length === 0 && (
+              <div className="text-[11px] text-red-500 mt-1">请至少添加一项任务</div>
+            )}
           </div>
           )}
           <div>