diff --git a/backend/routers/submissions.py b/backend/routers/submissions.py
index 43621a3..c9b68ee 100644
--- a/backend/routers/submissions.py
+++ b/backend/routers/submissions.py
@@ -194,6 +194,11 @@ def update_submission(
     }
 
     # 更新字段
+    if req.project_id is not None:
+        project = db.query(Project).filter(Project.id == req.project_id).first()
+        if not project:
+            raise HTTPException(status_code=404, detail="项目不存在")
+        sub.project_id = req.project_id
     if req.project_phase is not None:
         sub.project_phase = PhaseGroup(req.project_phase)
     if req.work_type is not None:
@@ -221,7 +226,7 @@ def update_submission(
     # 产出时长校验：前期内容不需要，中期/后期内容必须 > 0
     NO_DURATION_TYPES = {'策划案', '大纲/梗概', '概念设计图', '测试片', '剧本', '分镜', '人设图', '场景图', '道具图', '培训', '招聘面试', '内部其他'}
     content_val = sub.content_type.value if hasattr(sub.content_type, 'value') else sub.content_type
-    if content_val not in PRE_PHASE_TYPES and sub.total_seconds <= 0:
+    if content_val not in NO_DURATION_TYPES and sub.total_seconds <= 0:
         raise HTTPException(status_code=422, detail="请填写产出时长")
 
     # 保存新数据
diff --git a/backend/schemas.py b/backend/schemas.py
index 8278042..4071d1b 100644
--- a/backend/schemas.py
+++ b/backend/schemas.py
@@ -174,6 +174,7 @@ class SubmissionCreate(BaseModel):
 
 
 class SubmissionUpdate(BaseModel):
+    project_id: Optional[int] = None
     project_phase: Optional[str] = None
     work_type: Optional[str] = None
     content_type: Optional[str] = None
diff --git a/frontend/src/views/Submissions.vue b/frontend/src/views/Submissions.vue
index 8569e31..25b234a 100644
--- a/frontend/src/views/Submissions.vue
+++ b/frontend/src/views/Submissions.vue
@@ -156,8 +156,10 @@
     <!-- 编辑提交对话框 -->
     <el-dialog v-model="showEdit" title="编辑提交记录" width="580px" destroy-on-close>
       <el-form :model="editForm" label-width="110px" label-position="left">
-        <el-form-item label="所属项目">
-          <el-input :model-value="editForm._project_name" disabled />
+        <el-form-item label="所属项目" required>
+          <el-select v-model="editForm._project_id" style="width:100%" @change="onEditProjectChange">
+            <el-option v-for="p in activeProjects" :key="p.id" :label="p.name" :value="p.id" />
+          </el-select>
         </el-form-item>
         <template v-if="!isEditInternalProject">
           <el-row :gutter="16">
@@ -323,9 +325,21 @@ const isInternalProject = computed(() => {
   return proj?.name === INTERNAL_PROJECT_NAME
 })
 const isEditInternalProject = computed(() => {
-  return editForm._project_name === INTERNAL_PROJECT_NAME
+  const proj = activeProjects.value.find(p => p.id === editForm._project_id)
+  return proj?.name === INTERNAL_PROJECT_NAME
 })
 
+// 编辑时切换项目
+function onEditProjectChange(projectId) {
+  const proj = activeProjects.value.find(p => p.id === projectId)
+  editForm._project_name = proj?.name || ''
+  if (proj?.name === INTERNAL_PROJECT_NAME) {
+    editForm.project_phase = '内部事务'
+    editForm.work_type = '制作'
+    editForm.content_type = PHASE_CONTENT_TYPES['内部事务'][0]
+  }
+}
+
 // 根据阶段过滤内容类型（内部事务项目只显示内部事务类型）
 const filteredContentTypes = computed(() => {
   if (isInternalProject.value) return PHASE_CONTENT_TYPES['内部事务']
@@ -532,6 +546,7 @@ async function handleUpdate() {
   editing.value = true
   try {
     const { _id, _project_name, _project_id, ...payload } = editForm
+    payload.project_id = _project_id
     await submissionApi.update(_id, payload)
     ElMessage.success('修改成功')
     showEdit.value = false