diff --git a/models/migration.py b/models/migration.py
index e91cb4b..2f22c33 100644
--- a/models/migration.py
+++ b/models/migration.py
@@ -148,7 +148,6 @@ async def init_default_group() -> None:
         if not await Group.get(session, Group.name == "管理员"):
             admin_group = Group(
                 name="管理员",
-                policies="1",
                 max_storage=1 * 1024 * 1024 * 1024,  # 1GB
                 share_enabled=True,
                 web_dav_enabled=True,
@@ -194,7 +193,6 @@ async def init_default_group() -> None:
         if not await Group.get(session, Group.name == "游客"):
             guest_group = Group(
                 name="游客",
-                policies="[]",
                 share_enabled=False,
                 web_dav_enabled=False,
             )
@@ -210,6 +208,7 @@ async def init_default_user() -> None:
     from .user import User
     from .group import Group
     from .object import Object, ObjectType
+    from .policy import Policy
     from .database import get_session
 
     log.info('初始化管理员用户...')
@@ -224,6 +223,12 @@ async def init_default_user() -> None:
             if not admin_group:
                 raise RuntimeError("管理员用户组不存在，无法创建管理员用户")
 
+            # 获取默认存储策略
+            default_policy = await Policy.get(session, Policy.name == "本地存储")
+            if not default_policy:
+                raise RuntimeError("默认存储策略不存在，无法创建管理员用户")
+            default_policy_id = default_policy.id  # 在后续 save 前保存 UUID
+
             # 生成管理员密码
             admin_password = Password.generate(8)
             hashed_admin_password = Password.hash(admin_password)
@@ -245,7 +250,7 @@ async def init_default_user() -> None:
                 type=ObjectType.FOLDER,
                 owner_id=admin_user_id,
                 parent_id=None,
-                policy_id=1,  # 默认本地存储策略
+                policy_id=default_policy_id,
             ).save(session)
 
             log.info(f'初始管理员账号: admin')
diff --git a/models/object.py b/models/object.py
index 09b13dd..6ced3d5 100644
--- a/models/object.py
+++ b/models/object.py
@@ -47,8 +47,8 @@ class DirectoryCreateRequest(SQLModelBase):
     name: str
     """目录名称"""
 
-    policy_id: int | None = None
-    """存储策略ID，不指定则继承父目录"""
+    policy_id: UUID | None = None
+    """存储策略UUID，不指定则继承父目录"""
 
 
 class ObjectMoveRequest(SQLModelBase):
@@ -93,8 +93,8 @@ class ObjectResponse(ObjectBase):
 class PolicyResponse(SQLModelBase):
     """存储策略响应 DTO"""
 
-    id: str
-    """策略ID"""
+    id: UUID
+    """策略UUID"""
 
     name: str
     """策略名称"""
@@ -189,8 +189,8 @@ class Object(ObjectBase, UUIDTableBase, table=True):
     owner_id: UUID = Field(foreign_key="user.id", index=True)
     """所有者用户UUID"""
 
-    policy_id: int = Field(foreign_key="policy.id", index=True)
-    """存储策略ID（文件直接使用，目录作为子文件的默认策略）"""
+    policy_id: UUID = Field(foreign_key="policy.id", index=True)
+    """存储策略UUID（文件直接使用，目录作为子文件的默认策略）"""
 
     # ==================== 关系 ====================
 
diff --git a/models/policy.py b/models/policy.py
index dabbd67..9ed8319 100644
--- a/models/policy.py
+++ b/models/policy.py
@@ -1,8 +1,9 @@
+from typing import TYPE_CHECKING
 
-from typing import Optional, TYPE_CHECKING
-from sqlmodel import Field, Relationship, text
-from .base import TableBase
 from enum import StrEnum
+from sqlmodel import Field, Relationship, text
+
+from .base import UUIDTableBase
 
 if TYPE_CHECKING:
     from .object import Object
@@ -11,7 +12,7 @@ class PolicyType(StrEnum):
     LOCAL = "local"
     S3 = "s3"
 
-class Policy(TableBase, table=True):
+class Policy(UUIDTableBase, table=True):
     """存储策略模型"""
 
     name: str = Field(max_length=255, unique=True)
@@ -62,7 +63,7 @@ class Policy(TableBase, table=True):
     
     @staticmethod
     async def create(
-        policy: Optional["Policy"] = None,
+        policy: 'Policy | None' = None,
         **kwargs
     ):
         pass
\ No newline at end of file
diff --git a/models/response.py b/models/response.py
index 8a89106..dfa3201 100644
--- a/models/response.py
+++ b/models/response.py
@@ -3,24 +3,24 @@
 """
 
 from typing import Any
-from uuid import uuid4
+import uuid
 
 from sqlmodel import Field
 
 from .base import SQLModelBase
 
-
+# [TODO] 未来把这拆了，直接按需返回状态码
 class ResponseModel(SQLModelBase):
     """通用响应模型"""
 
     code: int = Field(default=0, ge=0, lt=60000)
     """系统内部状态码，0表示成功，其他表示失败"""
 
-    data: dict[str, Any] | list[Any] | str | int | float | None = None
+    data: Any = None
     """响应数据"""
 
     msg: str | None = None
     """响应消息，可以是错误消息或信息提示"""
 
-    instance_id: str = Field(default_factory=lambda: str(uuid4()))
+    instance_id: uuid.UUID = Field(default_factory=uuid.uuid4)
     """实例ID，用于标识请求的唯一性"""
diff --git a/routers/controllers/directory.py b/routers/controllers/directory.py
index f0e30a7..4fbb3e6 100644
--- a/routers/controllers/directory.py
+++ b/routers/controllers/directory.py
@@ -75,7 +75,7 @@ async def router_directory_get(
     ]
 
     policy_response = PolicyResponse(
-        id=str(policy.id),
+        id=policy.id,
         name=policy.name,
         type=policy.type.value,
         max_size=policy.max_size,