diff --git a/backend/app/api/admin.py b/backend/app/api/admin.py
index 111d5fb..f607e59 100644
--- a/backend/app/api/admin.py
+++ b/backend/app/api/admin.py
@@ -50,6 +50,7 @@ async def create_source(body: SourceIn, session: AsyncSession = Depends(get_sess
         translate_to=body.translate_to,
         enabled=body.enabled,
         headers_json=body.headers_json,
+        blocklist_tags=body.blocklist_tags or [],
     )
     session.add(src)
     try:
diff --git a/backend/app/api/admin_llm.py b/backend/app/api/admin_llm.py
index 2cdc1a9..723e1bb 100644
--- a/backend/app/api/admin_llm.py
+++ b/backend/app/api/admin_llm.py
@@ -38,6 +38,7 @@ async def get_settings():
                 classify_prompt=defaults["classify_prompt"],
                 commentary_prompt=defaults["commentary_prompt"],
                 image_prompt_template=defaults["image_prompt_template"],
+                blocklist_tags=[],
             )
         return LlmSettingOut.model_validate(row)
 
diff --git a/backend/app/schemas/source.py b/backend/app/schemas/source.py
index a3422a8..ecb0318 100644
--- a/backend/app/schemas/source.py
+++ b/backend/app/schemas/source.py
@@ -25,6 +25,8 @@ class SourceOut(BaseModel):
     last_fetched_at: datetime | None = None
     last_status: str | None = None
     consecutive_failures: int = 0
+    # 源级屏蔽分类标签;与 llm_settings.blocklist_tags 合并后注入 classify prompt
+    blocklist_tags: list[str] = []
 
 
 class SourceIn(BaseModel):
@@ -40,6 +42,7 @@ class SourceIn(BaseModel):
     enabled: bool = True
     detail_selector: dict | None = None
     headers_json: dict | None = None
+    blocklist_tags: list[str] = []
 
 
 class SourceUpdate(BaseModel):
@@ -49,3 +52,4 @@ class SourceUpdate(BaseModel):
     fetch_interval_min: int | None = Field(default=None, ge=5, le=1440)
     region: str | None = None
     translate_to: str | None = None
+    blocklist_tags: list[str] | None = None