diff --git a/apps/api/app/schemas/asset_diagnosis.py b/apps/api/app/schemas/asset_diagnosis.py
index 95b8684a8..ef6647e27 100644
--- a/apps/api/app/schemas/asset_diagnosis.py
+++ b/apps/api/app/schemas/asset_diagnosis.py
@@ -16,7 +16,7 @@ class AssetGapItem(BaseModel):
 
 
 class ProjectAssetDiagnosisResponse(BaseModel):
-    workspace_id: str
+    workspace_id: str = ""
     project_id: str
     readiness_score: int
     readiness_label: str
diff --git a/apps/api/app/schemas/edit_plan.py b/apps/api/app/schemas/edit_plan.py
index 5196120b3..993c43bcb 100644
--- a/apps/api/app/schemas/edit_plan.py
+++ b/apps/api/app/schemas/edit_plan.py
@@ -5,7 +5,7 @@ from pydantic import BaseModel, Field
 
 class EditTemplateResponse(BaseModel):
     id: str
-    workspace_id: str
+    workspace_id: str = ""
     project_id: str
     name: str
     description: str
@@ -28,7 +28,7 @@ class EditPlanClipResponse(BaseModel):
 
 class EditPlanResponse(BaseModel):
     id: str
-    workspace_id: str
+    workspace_id: str = ""
     project_id: str
     template_id: str
     asset_library_id: str
@@ -42,7 +42,7 @@ class EditPlanResponse(BaseModel):
 
 
 class CreateEditPlanRequest(BaseModel):
-    workspace_id: str
+    workspace_id: str = ""
     asset_library_id: str
     template_id: str = ""
     title_id: str = ""
@@ -50,7 +50,7 @@ class CreateEditPlanRequest(BaseModel):
 
 class AutoGenerateEditPlanRequest(BaseModel):
     """智能生成剪辑计划请求"""
-    workspace_id: str
+    workspace_id: str = ""
     asset_library_id: str
     editing_mode: str = Field(
         default="one_take",
diff --git a/apps/api/app/schemas/project_title.py b/apps/api/app/schemas/project_title.py
index c531b9059..9311af9bf 100644
--- a/apps/api/app/schemas/project_title.py
+++ b/apps/api/app/schemas/project_title.py
@@ -8,7 +8,7 @@ TitleCategory = Literal["default", "marketing", "tutorial", "story", "promo"]
 
 class ProjectTitleResponse(BaseModel):
     id: str
-    workspace_id: str
+    workspace_id: str = ""
     project_id: str
     text: str
     category: str
@@ -24,7 +24,7 @@ class ListProjectTitlesResponse(BaseModel):
 
 
 class CreateProjectTitleRequest(BaseModel):
-    workspace_id: str
+    workspace_id: str = ""
     text: str = Field(min_length=1, max_length=200)
     category: TitleCategory = "default"
     favorite: bool = False
diff --git a/apps/api/app/schemas/task_center.py b/apps/api/app/schemas/task_center.py
index 8873f7010..08fa63579 100644
--- a/apps/api/app/schemas/task_center.py
+++ b/apps/api/app/schemas/task_center.py
@@ -6,7 +6,7 @@ from pydantic import BaseModel, Field
 class ProjectTaskResponse(BaseModel):
     id: str
     task_type: str
-    workspace_id: str
+    workspace_id: str = ""
     project_id: str
     status: str
     progress: float
diff --git a/packages/domain/entities.py b/packages/domain/entities.py
index 4de800777..9c8015ecd 100644
--- a/packages/domain/entities.py
+++ b/packages/domain/entities.py
@@ -51,6 +51,7 @@ class Project:
     owner_user_id: str
     name: str
     description: str = ""
+    workspace_id: str = ""  # 兼容旧代码，待移除
     shared_users: list[str] = field(default_factory=list)  # 被共享的用户 ID 列表
     created_at: datetime = field(default_factory=lambda: datetime.now(timezone.utc))
 
diff --git a/packages/domain/generated_video.py b/packages/domain/generated_video.py
index 427beac0b..c82c9809d 100644
--- a/packages/domain/generated_video.py
+++ b/packages/domain/generated_video.py
@@ -9,7 +9,7 @@ from uuid import uuid4
 @dataclass(slots=True)
 class GeneratedVideo:
     id: str
-    workspace_id: str
+    workspace_id: str = ""
     project_id: str
     generation_task_id: str
     name: str
@@ -32,7 +32,7 @@ class GeneratedVideo:
     @classmethod
     def create(
         cls,
-        workspace_id: str,
+        workspace_id: str = "",
         project_id: str,
         generation_task_id: str,
         name: str,
@@ -46,9 +46,7 @@ class GeneratedVideo:
         thumbnail_url: str | None = None,
         generation_params: dict[str, Any] | None = None,
     ) -> "GeneratedVideo":
-        if not workspace_id.strip():
-            raise ValueError("workspace_id cannot be empty")
-        if not project_id.strip():
+if not project_id.strip():
             raise ValueError("project_id cannot be empty")
         if not generation_task_id.strip():
             raise ValueError("generation_task_id cannot be empty")
diff --git a/packages/domain/generation_task.py b/packages/domain/generation_task.py
index 4527d4a1b..f793f1e0d 100644
--- a/packages/domain/generation_task.py
+++ b/packages/domain/generation_task.py
@@ -17,7 +17,7 @@ class GenerationTaskStatus(StrEnum):
 @dataclass(slots=True)
 class GenerationTask:
     id: str
-    workspace_id: str
+    workspace_id: str = ""
     project_id: str
     asset_library_id: str
     strategy_id: str = ""
@@ -35,7 +35,7 @@ class GenerationTask:
     @classmethod
     def create(
         cls,
-        workspace_id: str,
+        workspace_id: str = "",
         project_id: str,
         asset_library_id: str,
         *,
@@ -44,9 +44,7 @@ class GenerationTask:
         edit_plan_id: str = "",
         created_by_user_id: str = "",
     ) -> "GenerationTask":
-        if not workspace_id.strip():
-            raise ValueError("workspace_id 不能为空")
-        if not project_id.strip():
+if not project_id.strip():
             raise ValueError("project_id 不能为空")
         if not asset_library_id.strip():
             raise ValueError("asset_library_id 不能为空")