diff --git a/app/application/site/mutation.py b/app/application/site/mutation.py
index d153f56d9..66fc82e25 100644
--- a/app/application/site/mutation.py
+++ b/app/application/site/mutation.py
@@ -149,6 +149,7 @@ class SiteMutationCommand:
         if await self._repository.async_get_by_domain(domain):
             return SiteMutationResult(False, f"{domain} 站点己存在")
 
+        values.pop("id", None)
         values.update(
             {
                 "domain": domain,
diff --git a/tests/test_site_mutation_command.py b/tests/test_site_mutation_command.py
index cd25925b1..be4d77b29 100644
--- a/tests/test_site_mutation_command.py
+++ b/tests/test_site_mutation_command.py
@@ -4,6 +4,7 @@ import pytest
 
 from app.application.site.contract import SiteMutation, SitePriorityMutation
 from app.application.site.mutation import SiteMutationCommand
+from app.schemas.site import Site
 
 
 def _command(**overrides):
@@ -56,6 +57,20 @@ async def test_create_site_commits_before_updated_event():
     assert mutation.values["public"] == 1
 
 
+@pytest.mark.asyncio
+async def test_create_site_ignores_schema_identity_field():
+    """手动新增站点应忽略请求 Schema 自动补出的空主键。"""
+    command, dependencies = _command()
+
+    result = await command.create(
+        Site(url="https://demo.example/path").model_dump()
+    )
+
+    assert result.success is True
+    mutation = dependencies["repository"].stage_create.await_args.args[0]
+    assert "id" not in mutation.values
+
+
 @pytest.mark.asyncio
 async def test_update_site_returns_legacy_not_found_without_writes():
     """更新不存在站点时保持失败响应且不产生事务或事件。"""