diff --git a/frontend/src/assets/sysA.jpeg b/frontend/src/assets/sysA.jpeg
new file mode 100644
index 0000000..57eb559
Binary files /dev/null and b/frontend/src/assets/sysA.jpeg differ
diff --git a/frontend/src/components/Sidebar.vue b/frontend/src/components/Sidebar.vue
index 084f8f9..6d444d5 100644
--- a/frontend/src/components/Sidebar.vue
+++ b/frontend/src/components/Sidebar.vue
@@ -19,12 +19,7 @@ const navItems = computed(() =>
 )
 
 const displayName = computed(() => store.currentUser?.name || '未登录')
-const roleLabel = computed(() => {
-  const roles = store.currentUser?.roles || []
-  if (!roles.length) return ''
-  if (roles.includes('admin') || store.currentUser?.is_superuser) return '管理员'
-  return roles[0]
-})
+const unitLabel = computed(() => store.currentUser?.unit_name || '')
 const avatarInitial = computed(() => (displayName.value || '?')[0].toUpperCase())
 
 async function onLogout() {
@@ -67,7 +62,7 @@ async function onLogout() {
         <div class="sidebar-user-avatar">{{ avatarInitial }}</div>
         <div class="sidebar-user-info">
           <div class="sidebar-user-name">{{ displayName }}</div>
-          <span v-if="roleLabel" class="sidebar-user-role">{{ roleLabel }}</span>
+          <span v-if="unitLabel" class="sidebar-user-role">{{ unitLabel }}</span>
         </div>
         <button class="sidebar-user-menu" type="button" title="更多">⋯</button>
       </div>
diff --git a/frontend/src/styles/main.css b/frontend/src/styles/main.css
index 4f65aa7..6d21878 100644
--- a/frontend/src/styles/main.css
+++ b/frontend/src/styles/main.css
@@ -1129,8 +1129,17 @@ button {
 }
 
 .msg-avatar.assistant {
-  background: linear-gradient(135deg, #ff8a8a 0%, #e63946 100%);
+  background: #fff;
   box-shadow: 0 4px 10px rgba(230, 57, 70, 0.3);
+  overflow: hidden;
+  padding: 0;
+}
+
+.msg-avatar.assistant img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  display: block;
 }
 
 .msg-avatar.user {
diff --git a/frontend/src/views/ChatView.vue b/frontend/src/views/ChatView.vue
index 4d3612f..abebd0e 100644
--- a/frontend/src/views/ChatView.vue
+++ b/frontend/src/views/ChatView.vue
@@ -3,6 +3,7 @@ import { computed, nextTick, onMounted, ref, watch } from 'vue'
 import { useChat } from '@/composables/useChat'
 import { useAppStore } from '@/stores/app'
 import { renderMarkdown } from '@/utils/markdown'
+import assistantAvatar from '@/assets/sysA.jpeg'
 
 const store = useAppStore()
 const {
@@ -266,7 +267,9 @@ watch(messages, scrollToEnd, { deep: true })
             class="message"
             :class="msg.role"
           >
-            <div v-if="msg.role === 'assistant'" class="msg-avatar assistant">✦</div>
+            <div v-if="msg.role === 'assistant'" class="msg-avatar assistant">
+              <img :src="assistantAvatar" alt="AI助手" />
+            </div>
             <div class="bubble-col">
               <div class="bubble">
                 <template v-if="msg.role === 'user'">