diff --git a/backend/app/routers/yichens.py b/backend/app/routers/yichens.py
index 296d4d0..3fd6a80 100644
--- a/backend/app/routers/yichens.py
+++ b/backend/app/routers/yichens.py
@@ -111,9 +111,10 @@ def get_posts(
     offset: int = Query(0, ge=0),
     category: Optional[str] = None,
     post_type: Optional[str] = None,
+    keyword: Optional[str] = None,
     db: Session = Depends(get_coolbot_db)
 ):
-    """获取帖子列表"""
+    """获取帖子列表 - 支持全局搜索"""
     query = """
         SELECT post_id, title, content, category, post_type, price, 
                author_username, post_time, reply_count, view_count, url
@@ -130,6 +131,11 @@ def get_posts(
         query += " AND post_type = :post_type"
         params["post_type"] = post_type
     
+    # 全局搜索 - 在标题、内容、分类、联系方式中搜索
+    if keyword:
+        query += " AND (title ILIKE :keyword OR content ILIKE :keyword OR category ILIKE :keyword OR author_username ILIKE :keyword)"
+        params["keyword"] = f"%{keyword}%"
+    
     query += " ORDER BY post_time DESC LIMIT :limit OFFSET :offset"
     
     results = db.execute(text(query), params).fetchall()
diff --git a/frontend/src/pages/YichensBoard.jsx b/frontend/src/pages/YichensBoard.jsx
index 6f8594c..cc866f4 100644
--- a/frontend/src/pages/YichensBoard.jsx
+++ b/frontend/src/pages/YichensBoard.jsx
@@ -35,16 +35,18 @@ export default function YichensBoard() {
     }
   }
 
-  const fetchPosts = async (p, cat) => {
+  const fetchPosts = async (p, cat, kw) => {
     setLoading(true)
     setError(null)
     const currentPage = p !== undefined ? p : page
     const currentCat = cat !== undefined ? cat : categoryFilter
+    const searchKw = kw !== undefined ? kw : searchKeyword
     
-    let url = '/api/yichens/posts?limit=50&offset=' + ((currentPage - 1) * 390)
+    let url = '/api/yichens/posts?limit=390&offset=' + ((currentPage - 1) * 390)
     if (postTypeFilter === 'deal') url += '&post_type=deal'
     else if (postTypeFilter === 'want') url += '&post_type=want'
     else if (postTypeFilter === 'other') url += '&post_type=normal'
+    if (searchKw && searchKw.trim()) url += '&keyword=' + encodeURIComponent(searchKw.trim())
     
     try {
       console.log('YichensBoard: 请求 posts', url)
@@ -63,17 +65,6 @@ export default function YichensBoard() {
           data = data.filter(p => p.category && !p.category.includes('龙') && !p.category.includes('纪念钞') && !p.category.includes('蛇') && !p.category.includes('马'))
         }
       }
-      if (searchKeyword) {
-        const kw = searchKeyword.trim()
-        if (kw) {
-          data = data.filter(p => 
-            (p.title && p.title.includes(kw)) ||
-            (p.content && p.content.includes(kw)) ||
-            (p.category && p.category.includes(kw)) ||
-            (p.contact && p.contact.includes(kw))
-          )
-        }
-      }
       setPosts(data)
       setTotalPosts(todayStats.total || 0)
     } catch(e) { 
@@ -218,16 +209,16 @@ export default function YichensBoard() {
 
           <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', padding: '12px 16px', background: '#1e293b', borderRadius: 12, marginTop: 16 }}>
             <div style={{ color: '#9ca3af', fontSize: 12 }}>
-              共 {totalPosts} 条帖子，{Math.ceil(totalPosts / 50)} 页，当前第 {page} 页
+              共 {totalPosts} 条帖子，{Math.ceil(totalPosts / 390)} 页，当前第 {page} 页
             </div>
             <div style={{ display: 'flex', gap: 8 }}>
               {page > 1 ? (
-                <button onClick={() => { const newPage = page - 1; setPage(newPage); fetchPosts(newPage, categoryFilter) }} style={{ padding: '6px 12px', borderRadius: 6, border: 'none', background: '#3b82f6', color: '#fff', cursor: 'pointer', fontSize: 12 }}>上一页</button>
+                <button onClick={() => { const newPage = page - 1; setPage(newPage); fetchPosts(newPage, categoryFilter, searchKeyword) }} style={{ padding: '6px 12px', borderRadius: 6, border: 'none', background: '#3b82f6', color: '#fff', cursor: 'pointer', fontSize: 12 }}>上一页</button>
               ) : (
                 <span style={{ padding: '6px 12px', borderRadius: 6, background: '#374151', color: '#6b7280', fontSize: 12 }}>上一页</span>
               )}
-              {posts.length >= 50 ? (
-                <button onClick={() => { const newPage = page + 1; setPage(newPage); fetchPosts(newPage, categoryFilter) }} style={{ padding: '6px 12px', borderRadius: 6, border: 'none', background: '#3b82f6', color: '#fff', cursor: 'pointer', fontSize: 12 }}>下一页</button>
+              {posts.length >= 390 ? (
+                <button onClick={() => { const newPage = page + 1; setPage(newPage); fetchPosts(newPage, categoryFilter, searchKeyword) }} style={{ padding: '6px 12px', borderRadius: 6, border: 'none', background: '#3b82f6', color: '#fff', cursor: 'pointer', fontSize: 12 }}>下一页</button>
               ) : (
                 <span style={{ padding: '6px 12px', borderRadius: 6, background: '#374151', color: '#6b7280', fontSize: 12 }}>下一页</span>
               )}