diff --git a/server/data/AdminPermissions.ts b/server/data/AdminPermissions.ts
new file mode 100644
index 0000000..27655e2
--- /dev/null
+++ b/server/data/AdminPermissions.ts
@@ -0,0 +1,6 @@
+export default class AdminPermissions {
+    static readonly OWNER = "OWNER"
+    static readonly MANAGE_ADMIN = "MANAGE_ADMIN"
+    static readonly MUTE_MEMBERS = "MUTE_MEMBERS"
+    static readonly REMOVE_MEMBERS = "REMOVE_MEMBERS"
+}
diff --git a/server/data/Chat.ts b/server/data/Chat.ts
index f0948b6..385f722 100644
--- a/server/data/Chat.ts
+++ b/server/data/Chat.ts
@@ -10,6 +10,7 @@ import User from "./User.ts"
 import ChatType from "./ChatType.ts"
 import UserChatLinker from "./UserChatLinker.ts"
 import DataWrongError from '../api/DataWrongError.ts'
+import ChatAdminLinker from "./ChatAdminLinker.ts"
 
 /**
  * Chat.ts - Wrapper and manager
@@ -80,6 +81,10 @@ export default class Chat {
         this.bean[key] = value
     }
 
+    addAdmin(userId: string, permission: string[] | string) {
+        ChatAdminLinker.linkAdminAndChat(userId, this.bean.id)
+        ChatAdminLinker.updatePermissions(userId, this.bean.id, permission instanceof Array ? JSON.stringify(permission) : permission)
+    }
     getMembersList() {
         return UserChatLinker.getChatMembers(this.bean.id)
     }
diff --git a/server/data/ChatAdminLinker.ts b/server/data/ChatAdminLinker.ts
new file mode 100644
index 0000000..9b236a3
--- /dev/null
+++ b/server/data/ChatAdminLinker.ts
@@ -0,0 +1,49 @@
+import { DatabaseSync } from "node:sqlite"
+import path from 'node:path'
+
+import config from "../config.ts"
+import { SQLInputValue } from "node:sqlite"
+export default class ChatAdminLinker {
+    static database: DatabaseSync = this.init()
+
+    private static init(): DatabaseSync {
+        const db: DatabaseSync = new DatabaseSync(path.join(config.data_path, 'ChatAdminLinker.db'))
+        db.exec(`
+            CREATE TABLE IF NOT EXISTS ChatAdminLinker (
+                /* 序号 */ count INTEGER PRIMARY KEY AUTOINCREMENT,
+                /* 用戶 ID */ user_id TEXT NOT NULL,
+                /* Chat ID */ chat_id TEXT NOT NULL,
+                /* 管理权限 */ permissions TEXT NOT NULL
+            );
+       `)
+        return db
+    }
+
+    static linkAdminAndChat(userId: string, chatId: string) {
+        if (!this.checkAdminIsLinkedToChat(userId, chatId))
+            this.database.prepare(`INSERT INTO ChatAdminLinker (
+                user_id,
+                chat_id,
+                permissions
+            ) VALUES (?, ?, ?);`).run(
+                userId,
+                chatId,
+                '[]'
+            )
+    }
+    static updatePermissions(userId: string, chatId: string, permissions: string) {
+        this.database.prepare(`UPDATE ChatAdminLinker SET permissions = ? WHERE user_id = ? AND chat_id = ?`).run(permissions, userId, chatId)
+    }
+    static unlinkAdminAndChat(userId: string, chatId: string) {
+        this.database.prepare(`DELETE FROM ChatAdminLinker WHERE user_id = ? AND chat_id = ?`).run(userId, chatId)
+    }
+    static checkAdminIsLinkedToChat(userId: string, chatId: string) {
+        return this.findAllByCondition('user_id = ? AND chat_id = ?', userId, chatId).length != 0
+    }
+    static getChatAdmins(chatId: string) {
+        return this.findAllByCondition('chat_id = ?', chatId).map((v) => v.user_id) as string[]
+    }
+    protected static findAllByCondition(condition: string, ...args: SQLInputValue[]) {
+        return this.database.prepare(`SELECT * FROM ChatAdminLinker WHERE ${condition}`).all(...args)
+    }
+}