diff --git a/client/api/ApiDeclare.ts b/client/api/ApiDeclare.ts
index 7b59b92..761aeb0 100644
--- a/client/api/ApiDeclare.ts
+++ b/client/api/ApiDeclare.ts
@@ -16,7 +16,10 @@ export type CallMethod =
     "User.getMyRecentChats" | 
 
     "Chat.getInfo" |
+
     "Chat.getIdForPrivate" |
+    "Chat.getAnotherUserIdFromPrivate" |
+
     "Chat.sendMessage" |
     "Chat.getMessageHistory" |
 
diff --git a/client/ui/App.tsx b/client/ui/App.tsx
index d15416d..cd2f7ae 100644
--- a/client/ui/App.tsx
+++ b/client/ui/App.tsx
@@ -135,6 +135,12 @@ export default function App() {
                 loginInputAccountRef={loginInputAccountRef}
                 loginInputPasswordRef={loginInputPasswordRef} />
 
+            <ChatInfoDialog
+                chatInfoDialogRef={chatInfoDialogRef as any}
+                openChatFragment={openChatFragment}
+                openUserInfoDialog={openUserInfoDialog}
+                chat={chatInfo} />
+
             <MyProfileDialog
                 myProfileDialogRef={myProfileDialogRef as any}
                 user={myUserProfileCache} />
@@ -143,11 +149,6 @@ export default function App() {
                 openChatFragment={openChatFragment}
                 user={userInfo} />
 
-            <ChatInfoDialog
-                chatInfoDialogRef={chatInfoDialogRef as any}
-                openChatFragment={openChatFragment}
-                chat={chatInfo} />
-
             <AddContactDialog
                 addContactDialogRef={addContactDialogRef} />
 
diff --git a/client/ui/AppMobile.tsx b/client/ui/AppMobile.tsx
index f7bf11e..bff55d8 100644
--- a/client/ui/AppMobile.tsx
+++ b/client/ui/AppMobile.tsx
@@ -156,6 +156,15 @@ export default function AppMobile() {
                 loginInputAccountRef={loginInputAccountRef}
                 loginInputPasswordRef={loginInputPasswordRef} />
 
+            <ChatInfoDialog
+                chatInfoDialogRef={chatInfoDialogRef as any}
+                openUserInfoDialog={openUserInfoDialog}
+                openChatFragment={(id) => {
+                    setCurrentChatId(id)
+                    setIsShowChatFragment(true)
+                }}
+                chat={chatInfo} />
+
             <MyProfileDialog
                 myProfileDialogRef={myProfileDialogRef as any}
                 user={myUserProfileCache} />
@@ -164,14 +173,6 @@ export default function AppMobile() {
                 openChatFragment={openChatFragment}
                 user={userInfo} />
 
-            <ChatInfoDialog
-                chatInfoDialogRef={chatInfoDialogRef as any}
-                openChatFragment={(id) => {
-                    setCurrentChatId(id)
-                    setIsShowChatFragment(true)
-                }}
-                chat={chatInfo} />
-
             <AddContactDialog
                 addContactDialogRef={addContactDialogRef} />
 
diff --git a/client/ui/dialog/ChatInfoDialog.tsx b/client/ui/dialog/ChatInfoDialog.tsx
index e83ae59..f3bdaa9 100644
--- a/client/ui/dialog/ChatInfoDialog.tsx
+++ b/client/ui/dialog/ChatInfoDialog.tsx
@@ -4,16 +4,18 @@ import useAsyncEffect from "../useAsyncEffect.ts"
 import Client from "../../api/Client.ts"
 import data from "../../Data.ts"
 import { Dialog } from "mdui"
-import Avatar from "../Avatar.tsx";
+import Avatar from "../Avatar.tsx"
 import { checkApiSuccessOrSncakbar } from "../snackbar.ts"
+import User from "../../api/client_data/User.ts"
 
 interface Args extends React.HTMLAttributes<HTMLElement> {
     chat: Chat
     openChatFragment: (id: string) => void
     chatInfoDialogRef: React.MutableRefObject<Dialog>
+    openUserInfoDialog: (user: User | string) => void
 }
 
-export default function ChatInfoDialog({ chat, chatInfoDialogRef, openChatFragment }: Args) {
+export default function ChatInfoDialog({ chat, chatInfoDialogRef, openChatFragment, openUserInfoDialog }: Args) {
     const [chatInfo, setChatInfo] = React.useState(null as unknown as Chat)
     const isMySelf = Client.myUserProfile?.id == chatInfo?.user_a_id && Client.myUserProfile?.id == chatInfo?.user_b_id
 
@@ -45,14 +47,26 @@ export default function ChatInfoDialog({ chat, chatInfoDialogRef, openChatFragme
             </div>
             <mdui-divider style={{
                 marginTop: "10px",
-                marginBottom: "10px",
             }}></mdui-divider>
 
             <mdui-list>
+                {
+                    chat?.type == 'private' &&
+                    <mdui-list-item icon="person" rounded onClick={async () => {
+                        const re = await Client.invoke("Chat.getAnotherUserIdFromPrivate", {
+                            token: data.access_token,
+                            target: chat.id,
+                        })
+                        if (re.code != 200)
+                            return checkApiSuccessOrSncakbar(re, '获取用户失败')
+
+                        openUserInfoDialog(re.data!.user_id as string)
+                    }}>用户详情</mdui-list-item>
+                }
                 <mdui-list-item icon="chat" rounded onClick={() => {
                     chatInfoDialogRef.current!.open = false
                     openChatFragment(chat.id)
-                }}>對話</mdui-list-item>
+                }}>打开此对话</mdui-list-item>
             </mdui-list>
         </mdui-dialog>
     )
diff --git a/server/api/ApiDeclare.ts b/server/api/ApiDeclare.ts
index 2e818fb..a9aba2c 100644
--- a/server/api/ApiDeclare.ts
+++ b/server/api/ApiDeclare.ts
@@ -16,7 +16,10 @@ export type CallMethod =
     "User.getMyRecentChats" | 
 
     "Chat.getInfo" |
+
     "Chat.getIdForPrivate" |
+    "Chat.getAnotherUserIdFromPrivate" |
+
     "Chat.sendMessage" |
     "Chat.getMessageHistory" |
 
diff --git a/server/api/ChatApi.ts b/server/api/ChatApi.ts
index 6dd3402..980b57a 100644
--- a/server/api/ChatApi.ts
+++ b/server/api/ChatApi.ts
@@ -197,9 +197,9 @@ export default class ChatApi extends BaseApi {
             }
         })
         /**
-         * 獲取對話訊息
+         * 获取私聊的 ChatId
          * @param token 令牌
-         * @param target 目標對用户
+         * @param target 目標用户
          */
         this.registerEvent("Chat.getIdForPrivate", (args, { deviceId }) => {
             if (this.checkArgsMissing(args, ['token', 'target'])) return {
@@ -230,5 +230,48 @@ export default class ChatApi extends BaseApi {
                 }
             }
         })
+        /**
+         * 从私聊获取对方的 UserId
+         * @param token 令牌
+         * @param target 目標对话
+         */
+        this.registerEvent("Chat.getAnotherUserIdFromPrivate", (args, { deviceId }) => {
+            if (this.checkArgsMissing(args, ['token', 'target'])) return {
+                msg: "參數缺失",
+                code: 400,
+            }
+
+            const token = TokenManager.decode(args.token as string)
+            if (!this.checkToken(token, deviceId)) return {
+                code: 401,
+                msg: "令牌無效",
+            }
+
+            const user = User.findById(token.author) as User
+
+            const chat = Chat.findById(args.target as string)
+            if (chat == null) return {
+                code: 404,
+                msg: "對話不存在",
+            }
+            if (!UserChatLinker.checkUserIsLinkedToChat(token.author, chat!.bean.id)) return {
+                code: 400,
+                msg: "用戶無權訪問該對話",
+            }
+
+            if (chat.bean.type == 'private')
+                return {
+                    code: 200,
+                    msg: '成功',
+                    data: {
+                        user_id: chat.getAnotherUserForPrivate(user)?.bean.id
+                    }
+                }
+            
+            return {
+                code: 403,
+                msg: "非私聊对话",
+            }
+        })
     }
 }
\ No newline at end of file