diff --git a/core/frontend/src/components/app-shell.tsx b/core/frontend/src/components/app-shell.tsx
index ff03231..6e5a8a1 100644
--- a/core/frontend/src/components/app-shell.tsx
+++ b/core/frontend/src/components/app-shell.tsx
@@ -167,7 +167,7 @@ function AccountMenu({ anchorRect, onClose, navigate, logout, user, team, canMan
       style={{ left: pos.left, top: pos.top }}
     >
       <div className="shell-account-head">
-        <span className="av">{avatar}</span>
+        <span className="av">{user.avatar_url ? <img src={user.avatar_url} alt="头像" /> : avatar}</span>
         <span>
           <span className="nm">{team?.name || user.username}</span>
           <span className="mail">{user.username}</span>
@@ -374,7 +374,7 @@ export function Sidebar({ page, navigate, user, team, canManageBilling = true, p
           onClick={toggleAccountMenu}
           onKeyDown={(event) => { if (event.key === "Enter" || event.key === " ") { event.preventDefault(); toggleAccountMenu(event as unknown as ReactMouseEvent<HTMLElement>); } }}
         >
-          <div className="av">{avatar}</div>
+          <div className="av">{user.avatar_url ? <img src={user.avatar_url} alt="头像" /> : avatar}</div>
           <div className="em">{team?.name || user.username}</div>
         </div>
       </div>
diff --git a/core/frontend/src/design-restraint.css b/core/frontend/src/design-restraint.css
index 3f0866d..fceb338 100644
--- a/core/frontend/src/design-restraint.css
+++ b/core/frontend/src/design-restraint.css
@@ -375,7 +375,9 @@ nav a.disabled:hover { background: transparent; color: var(--black-alpha-32); }
   color: var(--accent-white);
   display: flex; align-items: center; justify-content: center;
   font-weight: 600; font-size: 12px;
+  overflow: hidden;
 }
+.user .av img { width: 100%; height: 100%; object-fit: cover; display: block; }
 .user .em { font-size: 13px; color: var(--accent-black); }
 
 body.sidebar-collapsed aside.sidebar { padding: 22px 12px; }
@@ -1948,7 +1950,9 @@ table.t tbody tr:hover { background: var(--black-alpha-4); }
   color: var(--accent-white);
   font-size: 12px;
   font-weight: 600;
+  overflow: hidden;
 }
+.shell-account-head .av img { width: 100%; height: 100%; object-fit: cover; display: block; }
 .shell-account-head .nm {
   display: block;
   font-size: 13px;
diff --git a/core/frontend/src/routes/settings.tsx b/core/frontend/src/routes/settings.tsx
index 6660c0e..e86e89f 100644
--- a/core/frontend/src/routes/settings.tsx
+++ b/core/frontend/src/routes/settings.tsx
@@ -434,7 +434,7 @@ export function SettingsPage({
                 <div className="lbl">头像</div>
                 <div className="val">
                   <div className="avatar-edit">
-                    <div className="av-big">{avatarChar}</div>
+                    <div className="av-big">{user.avatar_url ? <img src={user.avatar_url} alt="头像" /> : avatarChar}</div>
                     <div className="av-actions">
                       <button className="btn btn-sm" type="button" onClick={openAvatarModal}>上传新头像</button>
                       <button className="btn btn-ghost btn-sm" type="button" onClick={() => onResetAvatar?.()}>恢复默认</button>
diff --git a/core/frontend/src/types.ts b/core/frontend/src/types.ts
index a15c71e..c0f5f99 100644
--- a/core/frontend/src/types.ts
+++ b/core/frontend/src/types.ts
@@ -4,6 +4,8 @@ export type User = {
   email: string;
   status: string;
   is_platform_admin?: boolean;
+  // 头像直链(后端 UserSerializer.avatar_url):空则前端回退姓氏首字占位
+  avatar_url?: string;
 };
 
 export type Team = {