diff --git a/client/api/ApiDeclare.ts b/client/api/ApiDeclare.ts
index 896402e..e02882e 100644
--- a/client/api/ApiDeclare.ts
+++ b/client/api/ApiDeclare.ts
@@ -19,6 +19,7 @@ export type CallMethod =
     "Chat.getInfo" |
     
     "Chat.updateSettings" |
+    "Chat.setAvatar" |
 
     "Chat.createGroup" |
 
diff --git a/client/api/client_data/GroupSettings.ts b/client/api/client_data/GroupSettings.ts
index 14a007e..eeac578 100644
--- a/client/api/client_data/GroupSettings.ts
+++ b/client/api/client_data/GroupSettings.ts
@@ -4,6 +4,10 @@ interface GroupSettings {
     new_member_join_method?: 'disabled' | 'allowed_by_admin' | 'answered_and_allowed_by_admin'
     answered_and_allowed_by_admin_question?: string
 
+    // 下面两个比较特殊, 由服务端给予
+    group_title: string
+    group_id: string
+
     [key: string]: unknown
 }
 
diff --git a/client/ui/chat/ChatFragment.tsx b/client/ui/chat/ChatFragment.tsx
index 58b6e10..519ae98 100644
--- a/client/ui/chat/ChatFragment.tsx
+++ b/client/ui/chat/ChatFragment.tsx
@@ -195,6 +195,7 @@ export default function ChatFragment({ target, showReturnButton, onReturnButtonC
     }
 
     const attachFileInputRef = React.useRef<HTMLInputElement>(null)
+    const uploadChatAvatarRef = React.useRef<HTMLInputElement>(null)
 
     function insertText(text: string) {
         const input = inputRef.current!.shadowRoot!.querySelector('[part=input]') as HTMLTextAreaElement
@@ -224,6 +225,22 @@ export default function ChatFragment({ target, showReturnButton, onReturnButtonC
             addFile(file.type, file.name, file)
         }
     })
+    useEventListener(uploadChatAvatarRef, 'change', async (_e) => {
+        const file = uploadChatAvatarRef.current!.files?.[0] as File
+        if (file == null) return
+
+        const re = await Client.invoke("Chat.setAvatar", {
+            token: data.access_token,
+            target: target,
+            avatar: file
+        })
+
+        if (checkApiSuccessOrSncakbar(re, "修改失败")) return
+        snackbar({
+            message: "修改成功 (刷新页面以更新)",
+            placement: "top",
+        })
+    })
 
     const groupPreferenceStore = new PreferenceStore<GroupSettings>()
     groupPreferenceStore.setOnUpdate(async (value, oldvalue) => {
@@ -494,9 +511,35 @@ export default function ChatFragment({ target, showReturnButton, onReturnButtonC
                     flexDirection: "column",
                     height: "100%",
                 }}>
+                    <div style={{
+                        display: 'none'
+                    }}>
+                        <input accept="image/*" type="file" name="上传对话头像" ref={uploadChatAvatarRef}></input>
+                    </div>
                     {
                         chatInfo.type == 'group' && <PreferenceLayout>
                             <PreferenceUpdater.Provider value={groupPreferenceStore.createUpdater()}>
+                                <PreferenceHeader
+                                    title="群组资料" />
+                                <Preference
+                                    title="上传新的头像"
+                                    icon="image"
+                                    disabled={!chatInfo.is_admin}
+                                    onClick={() => {
+                                        uploadChatAvatarRef.current!.click()
+                                    }} />
+                                <TextFieldPreference
+                                    title="设置群名称"
+                                    icon="edit"
+                                    id="group_title"
+                                    state={groupPreferenceStore.state.group_title || ''}
+                                    disabled={!chatInfo.is_admin} />
+                                <TextFieldPreference
+                                    title="设置群 ID"
+                                    icon="edit"
+                                    id="group_id"
+                                    state={groupPreferenceStore.state.group_id || ''}
+                                    disabled={!chatInfo.is_admin} />
                                 <PreferenceHeader
                                     title="群组管理" />
                                 <Preference
diff --git a/server/api/ApiDeclare.ts b/server/api/ApiDeclare.ts
index daeea21..12b380f 100644
--- a/server/api/ApiDeclare.ts
+++ b/server/api/ApiDeclare.ts
@@ -19,6 +19,7 @@ export type CallMethod =
     "Chat.getInfo" |
     
     "Chat.updateSettings" |
+    "Chat.setAvatar" |
 
     "Chat.createGroup" |
 
diff --git a/server/api/ChatApi.ts b/server/api/ChatApi.ts
index c90dcb6..7b830bb 100644
--- a/server/api/ChatApi.ts
+++ b/server/api/ChatApi.ts
@@ -437,7 +437,12 @@ export default class ChatApi extends BaseApi {
                         type: chat.bean.type,
                         title: chat.getTitle(),
                         avatar_file_hash: chat.getAvatarFileHash() ? chat.getAvatarFileHash() : undefined,
-                        settings: JSON.parse(chat.bean.settings),
+                        settings: {
+                            ...JSON.parse(chat.bean.settings),
+                            // 下面两个比较特殊, 用于群设置
+                            group_id: chat.bean.id,
+                            group_title: chat.getTitle(),
+                        },
                         is_member: UserChatLinker.checkUserIsLinkedToChat(token.author, chat!.bean.id),
                         is_admin: chat.checkUserIsAdmin(token.author),
                     }
@@ -449,8 +454,44 @@ export default class ChatApi extends BaseApi {
                 msg: "找不到对话",
             }
         })
+        // 更新頭像
+        this.registerEvent("Chat.setAvatar", (args, { deviceId }) => {
+            if (this.checkArgsMissing(args, ['avatar', 'token'])) return {
+                msg: "参数缺失",
+                code: 400,
+            }
+            if (!(args.avatar instanceof Buffer)) return {
+                msg: "参数不合法",
+                code: 400,
+            }
+            const token = TokenManager.decode(args.token as string)
+
+            const user = User.findById(token.author) as User
+
+            const chat = Chat.findById(args.target as string)
+            if (chat == null) return {
+                code: 404,
+                msg: "对话不存在",
+            }
+
+            if (chat.bean.type == 'group')
+                if (chat.checkUserIsAdmin(user.bean.id)) {
+                    const avatar: Buffer = args.avatar as Buffer
+                    if (avatar)
+                        chat.setAvatar(avatar)
+                } else
+                    return {
+                        code: 403,
+                        msg: "没有此权限",
+                    }
+
+            return {
+                msg: "成功",
+                code: 200,
+            }
+        })
         /**
-         * 更新设定
+         * 更新设定 (包括资料)
          * @param token 令牌
          * @param title 名称
          * @param [id] 群组 ID
@@ -475,9 +516,15 @@ export default class ChatApi extends BaseApi {
             }
 
             if (chat.bean.type == 'group')
-                if (chat.checkUserIsAdmin(user.bean.id))
+                if (chat.checkUserIsAdmin(user.bean.id)) {
                     ChatGroup.fromChat(chat).getSettings().update(args.settings as GroupSettingsBean)
-                else
+
+                    const settings = args.settings as any
+                    if (settings.group_title != null)
+                        chat.setTitle(settings.group_title)
+                    if (settings.group_id != null)
+                        chat.setId(settings.group_id)
+                } else
                     return {
                         code: 403,
                         msg: "没有此权限",
diff --git a/server/data/Chat.ts b/server/data/Chat.ts
index 52bfa93..addbe69 100644
--- a/server/data/Chat.ts
+++ b/server/data/Chat.ts
@@ -200,10 +200,8 @@ export default class Chat {
 
         return null
     }
-    getId() {
-        return this.bean.id
-    }
     setId(id: string) {
+        if (this.bean.id == id) return
         if (Chat.findAllChatBeansByCondition('id = ?', id).length > 0)
             throw new DataWrongError(`对话ID ${id} 已被使用`)
         this.setAttr("id", id)