diff --git a/src/common/data_models/expression_data_model.py b/src/common/data_models/expression_data_model.py
new file mode 100644
index 00000000..8b8a9e28
--- /dev/null
+++ b/src/common/data_models/expression_data_model.py
@@ -0,0 +1,89 @@
+from datetime import datetime
+from typing import List, Optional, Literal
+
+import json
+
+from src.common.database.database_model import Expression
+
+from . import BaseDatabaseDataModel
+
+
+class MaiExpression(BaseDatabaseDataModel[Expression]):
+    def __init__(
+        self,
+        item_id: int,
+        situation: str,
+        style: str,
+        context: str,
+        # up_content: str,
+        content: List[str],
+        count: int,
+        last_active_time: datetime,
+        create_time: datetime,
+        session_id: Optional[str] = None,
+        checked: bool = False,
+        rejected: bool = False,
+        modified_by: Optional[Literal["ai", "user"]] = None,
+    ):
+        self.item_id = item_id
+        """自增主键ID"""
+        self.situation = situation
+        """表达方式使用情景"""
+        self.style = style
+        """表达方式风格"""
+        self.context = context
+        """表达方式上下文"""
+        # self.up_content = up_content
+        self.content: List[str] = content
+        """内容列表"""
+        self.count: int = count
+        self.last_active_time: datetime = last_active_time or datetime.now()
+        self.create_time: datetime = create_time or datetime.now()
+        self.session_id: Optional[str] = session_id
+        
+        self.checked: bool = checked
+        """是否已经被检查过"""
+        self.rejected: bool = rejected
+        """是否被拒绝但是未更新"""
+        self.modified_by: Optional[Literal["ai", "user"]] = modified_by
+        """最后修改者，标记用户或AI，为空表示未检查"""
+
+    @classmethod
+    def from_db_instance(cls, db_record: Expression):
+        content_list = json.loads(db_record.content_list) if db_record.content_list else []
+        for item in content_list:
+            if not isinstance(item, str):
+                raise ValueError(f"Content item must be a string, got {type(item)}")
+        return cls(
+            item_id=db_record.id,  # type: ignore
+            situation=db_record.situation,
+            style=db_record.style,
+            context=db_record.context,
+            content=content_list,
+            count=db_record.count,
+            last_active_time=db_record.last_active_time,
+            create_time=db_record.create_time,
+            session_id=db_record.session_id,
+            checked=db_record.checked,
+            rejected=db_record.rejected,
+            modified_by=db_record.modified_by,
+        )
+
+    def to_db_instance(self):
+        for item in self.content:
+            if not isinstance(item, str):
+                raise ValueError(f"Content item must be a string, got {type(item)}")
+        return Expression(
+            id=self.item_id,
+            situation=self.situation,
+            style=self.style,
+            context=self.context,
+            content_list=json.dumps(self.content),
+            count=self.count,
+            last_active_time=self.last_active_time,
+            create_time=self.create_time,
+            session_id=self.session_id,
+            checked=self.checked,
+            rejected=self.rejected,
+            modified_by=self.modified_by,
+        )
diff --git a/src/common/database/database_model.py b/src/common/database/database_model.py
index bc03758e..112ce2bd 100644
--- a/src/common/database/database_model.py
+++ b/src/common/database/database_model.py
@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Optional, Literal
 from sqlalchemy import Column, Float, Enum as SQLEnum, DateTime
 from sqlmodel import SQLModel, Field, LargeBinary
 from enum import Enum
@@ -171,7 +171,7 @@ class Expression(SQLModel, table=True):
     style: str = Field(index=True, max_length=255, primary_key=True)  # 风格
 
     context: str  # 上下文
-    up_content: str
+    # up_content: str
 
     content_list: str  # 内容列表，JSON格式存储
     count: int = Field(default=0)  # 使用次数
@@ -181,6 +181,10 @@ class Expression(SQLModel, table=True):
     create_time: datetime = Field(default_factory=datetime.now, sa_column=Column(DateTime))  # 创建时间
     session_id: Optional[str] = Field(default=None, max_length=255, nullable=True)  # 会话ID，区分是否为全局表达方式
 
+    checked: bool = Field(default=False)  # 是否已经被检查过
+    rejected: bool = Field(default=False)  # 是否被拒绝但是未更新
+    modified_by: Optional[Literal["ai", "user"]] = Field(default=None)  # 最后修改者，标记用户或AI，为空表示未检查
+
 
 class Jargon(SQLModel, table=True):
     """存黑话的模型"""