diff --git a/backend/apps/generation/views.py b/backend/apps/generation/views.py
index 72737bc..61ec22e 100644
--- a/backend/apps/generation/views.py
+++ b/backend/apps/generation/views.py
@@ -2750,18 +2750,35 @@ def asset_groups_view(request):
     team = request.user.team
 
     if request.method == 'GET':
-        groups = (
+        groups = list(
             AssetGroup.objects
             .filter(team=team)
             .annotate(asset_count=Count('assets'))
             .order_by('-created_at')
         )
+
+        # 从火山同步素材组名字（一次 API 调用）
+        remote_ids = [g.remote_group_id for g in groups if g.remote_group_id]
+        if remote_ids:
+            try:
+                from utils.assets_client import list_asset_groups
+                remote_items, _ = list_asset_groups(page=1, page_size=100)
+                remote_name_map = {item['Id']: item.get('Name', '') for item in remote_items if 'Id' in item}
+                for g in groups:
+                    if g.remote_group_id and g.remote_group_id in remote_name_map:
+                        remote_name = remote_name_map[g.remote_group_id]
+                        if remote_name and remote_name != g.name:
+                            g.name = remote_name
+                            g.save(update_fields=['name'])
+            except Exception:
+                pass  # 同步失败不影响列表展示
+
         results = []
         for g in groups:
             results.append({
                 'id': g.id,
                 'name': g.name,
-                'thumbnail_url': g.thumbnail_url,
+                'thumbnail_url': g.thumbnail_url if g.asset_count > 0 else '',
                 'asset_count': g.asset_count,
                 'remote_group_id': g.remote_group_id,
                 'created_at': g.created_at.isoformat(),
@@ -2784,12 +2801,12 @@ def asset_groups_view(request):
         w, h = img.size
         if w < 300 or h < 300:
             return Response(
-                {'error': f'图片尺寸太小（{w}x{h}），宽高均需 ≥ 300px'},
+                {'error': f'图片太小了，请上传更大的图片（当前 {w}x{h}，最小要求 300x300）'},
                 status=status.HTTP_400_BAD_REQUEST,
             )
         if w > 6000 or h > 6000:
             return Response(
-                {'error': f'图片尺寸太大（{w}x{h}），宽高均需 ≤ 6000px'},
+                {'error': f'图片太大了，请压缩后重试（当前 {w}x{h}，最大支持 6000x6000）'},
                 status=status.HTTP_400_BAD_REQUEST,
             )
         file.seek(0)  # Reset after PIL read
@@ -2868,6 +2885,18 @@ def asset_group_detail_view(request, group_id):
         return Response({'error': '素材组不存在'}, status=status.HTTP_404_NOT_FOUND)
 
     if request.method == 'GET':
+        # 同步火山端的素材组名字
+        if group.remote_group_id:
+            try:
+                from utils.assets_client import get_asset_group
+                remote = get_asset_group(group.remote_group_id)
+                remote_name = remote.get('Name', '')
+                if remote_name and remote_name != group.name:
+                    group.name = remote_name
+                    group.save(update_fields=['name'])
+            except Exception:
+                pass  # 查不到就用本地名字
+
         assets_qs = Asset.objects.filter(group=group).order_by('-created_at')
         asset_list = []
         for a in assets_qs:
@@ -2947,12 +2976,12 @@ def asset_group_add_asset_view(request, group_id):
         w, h = img.size
         if w < 300 or h < 300:
             return Response(
-                {'error': f'图片尺寸太小（{w}x{h}），宽高均需 ≥ 300px'},
+                {'error': f'图片太小了，请上传更大的图片（当前 {w}x{h}，最小要求 300x300）'},
                 status=status.HTTP_400_BAD_REQUEST,
             )
         if w > 6000 or h > 6000:
             return Response(
-                {'error': f'图片尺寸太大（{w}x{h}），宽高均需 ≤ 6000px'},
+                {'error': f'图片太大了，请压缩后重试（当前 {w}x{h}，最大支持 6000x6000）'},
                 status=status.HTTP_400_BAD_REQUEST,
             )
         file.seek(0)
@@ -3053,6 +3082,7 @@ def asset_search_view(request):
     groups = (
         AssetGroup.objects
         .filter(team=team, name__icontains=q)
+        .annotate(asset_count=Count('assets'))
         .order_by('-created_at')[:20]
     )
     results = []
@@ -3060,7 +3090,8 @@ def asset_search_view(request):
         results.append({
             'id': g.id,
             'name': g.name,
-            'thumbnail_url': g.thumbnail_url,
+            'thumbnail_url': g.thumbnail_url if g.asset_count > 0 else '',
+            'asset_count': g.asset_count,
             'remote_group_id': g.remote_group_id,
         })
     return Response({'results': results})
diff --git a/backend/utils/assets_client.py b/backend/utils/assets_client.py
index ca306da..a5f54e8 100644
--- a/backend/utils/assets_client.py
+++ b/backend/utils/assets_client.py
@@ -167,6 +167,12 @@ def get_asset(asset_id: str) -> dict:
     return _do_request('GetAsset', body)
 
 
+def get_asset_group(group_id: str) -> dict:
+    """Get single asset group details."""
+    body = {'Id': group_id, 'ProjectName': PROJECT_NAME}
+    return _do_request('GetAssetGroup', body)
+
+
 def update_asset_group(group_id: str, name: str = None, description: str = None):
     """Update an asset group's name and/or description."""
     body = {'Id': group_id, 'ProjectName': PROJECT_NAME}
diff --git a/web/src/components/AssetLibraryModal.tsx b/web/src/components/AssetLibraryModal.tsx
index ce9c28e..e8780f1 100644
--- a/web/src/components/AssetLibraryModal.tsx
+++ b/web/src/components/AssetLibraryModal.tsx
@@ -211,7 +211,11 @@ export function AssetLibraryModal({ open, onClose }: Props) {
                 <div className={styles.grid}>
                   {groups.map((group) => (
                     <div key={group.id} className={styles.card} onClick={() => handleGroupClick(group)}>
-                      <img src={tosThumb(group.thumbnail_url, 300)} alt={group.name} className={styles.cardThumb} />
+                      {group.asset_count === 0 ? (
+                        <div className={styles.cardThumb} style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', color: 'var(--color-text-disabled)', fontSize: 12 }}>暂无图片</div>
+                      ) : (
+                        <img src={tosThumb(group.thumbnail_url, 300)} alt={group.name} className={styles.cardThumb} />
+                      )}
                       <div className={styles.cardInfo}>
                         {editingName && editingName.id === group.id ? (
                           <div className={styles.inlineEditWrap} onClick={(e) => e.stopPropagation()}>
@@ -406,6 +410,7 @@ export function AssetLibraryModal({ open, onClose }: Props) {
                     </>
                   )}
                   <div className={styles.dropZoneWarning}>⚠️ 素材上传后无法删除，请确认后再上传</div>
+                  <div className={styles.dropZoneWarning}>⚠️ 图片尺寸要求：宽高均需在 300~6000 像素之间</div>
                 </div>
                 <input
                   ref={fileInputRef}
diff --git a/web/src/components/PromptInput.module.css b/web/src/components/PromptInput.module.css
index 2c62e30..4cc6023 100644
--- a/web/src/components/PromptInput.module.css
+++ b/web/src/components/PromptInput.module.css
@@ -125,6 +125,9 @@
   overflow: hidden;
   flex-shrink: 0;
   background: #2a2a3a;
+  display: flex;
+  align-items: center;
+  justify-content: center;
 }
 
 .thumbMedia {
diff --git a/web/src/components/PromptInput.tsx b/web/src/components/PromptInput.tsx
index 3457ea9..5f3f557 100644
--- a/web/src/components/PromptInput.tsx
+++ b/web/src/components/PromptInput.tsx
@@ -271,8 +271,8 @@ export function PromptInput() {
         typedAtRef.current = true;
         setMentionMode('references');
         openMentionPopup();
-      } else if (/[\u4e00-\u9fff]+/.test(textAfterAt) && !textAfterAt.includes(' ')) {
-        // Chinese text after @, search assets
+      } else if (textAfterAt.length > 0 && !textAfterAt.includes(' ')) {
+        // Text after @, search assets (Chinese + English)
         if (searchTimerRef.current) clearTimeout(searchTimerRef.current);
         searchTimerRef.current = setTimeout(() => {
           assetsApi.search(textAfterAt).then((res) => {
@@ -641,7 +641,11 @@ export function PromptInput() {
                   }}
                 >
                   <div className={styles.mentionThumb}>
-                    <img src={tosThumb(group.thumbnail_url, 72)} alt="" className={styles.thumbMedia} />
+                    {group.thumbnail_url ? (
+                      <img src={tosThumb(group.thumbnail_url, 72)} alt="" className={styles.thumbMedia} />
+                    ) : (
+                      <span style={{ fontSize: 9, color: 'var(--color-text-disabled)' }}>无图</span>
+                    )}
                   </div>
                   <span className={styles.mentionLabel}>{group.name}</span>
                   <span className={styles.mentionType}>人像</span>
diff --git a/web/src/pages/ProfilePage.module.css b/web/src/pages/ProfilePage.module.css
index 7cbaf16..441f727 100644
--- a/web/src/pages/ProfilePage.module.css
+++ b/web/src/pages/ProfilePage.module.css
@@ -3,6 +3,8 @@
   margin: 0 auto;
   padding: 24px 20px 60px;
   min-height: 100vh;
+  height: 100vh;
+  overflow-y: auto;
 }
 
 /* Header */