diff --git a/src/knowledge/milvus_kb.py b/src/knowledge/milvus_kb.py
index be4d6fae..f0a7727a 100644
--- a/src/knowledge/milvus_kb.py
+++ b/src/knowledge/milvus_kb.py
@@ -311,8 +311,8 @@ class MilvusKB(KnowledgeBase):
 
         try:
             # 设置查询参数 - Milvus 知识库特有的参数
-            top_k = kwargs.get("top_k", 10)
-            similarity_threshold = kwargs.get("similarity_threshold", 0.0)  # 相似度阈值
+            top_k = kwargs.get("top_k", 30)
+            similarity_threshold = kwargs.get("similarity_threshold", 0.2)  # 相似度阈值
             include_distances = kwargs.get("include_distances", True)  # 是否包含距离信息
             metric_type = kwargs.get("metric_type", "COSINE")  # 距离度量类型
 
@@ -367,19 +367,31 @@ class MilvusKB(KnowledgeBase):
         """删除文件"""
         collection = await self._get_milvus_collection(db_id)
 
-        def _delete_from_milvus():
-            """同步执行 Milvus 删除操作的辅助函数"""
+        if collection:
+            # 先查询文件是否存在，避免不必要的删除操作
             try:
                 expr = f'file_id == "{file_id}"'
-                collection.delete(expr)
-                collection.flush()
-                logger.info(f"Deleted chunks for file {file_id} from Milvus")
+                results = collection.query(
+                    expr=expr,
+                    output_fields=["id"],
+                    limit=1
+                )
+
+                if not results:
+                    logger.info(f"File {file_id} not found in Milvus, skipping delete operation")
+                else:
+                    # 只有在文件确实存在时才执行删除
+                    def _delete_from_milvus():
+                        try:
+                            collection.delete(expr)
+                            collection.flush()
+                            logger.info(f"Deleted chunks for file {file_id} from Milvus")
+                        except Exception as e:
+                            logger.error(f"Error deleting file {file_id} from Milvus: {e}")
+
+                    await asyncio.to_thread(_delete_from_milvus)
             except Exception as e:
-                logger.error(f"Error deleting file {file_id} from Milvus: {e}")
-
-        if collection:
-            await asyncio.to_thread(_delete_from_milvus)
-
+                logger.error(f"Error checking file existence in Milvus: {e}")
         # 使用锁确保元数据操作的原子性
         async with self._metadata_lock:
             if file_id in self.files_meta:
diff --git a/web/src/views/DataBaseInfoView.vue b/web/src/views/DataBaseInfoView.vue
index f13fed45..9ef11399 100644
--- a/web/src/views/DataBaseInfoView.vue
+++ b/web/src/views/DataBaseInfoView.vue
@@ -271,7 +271,7 @@
         </div>
         <div class="info-item">
           <label>上传时间:</label>
-          <span>{{ formatRelativeTime(Math.round(selectedFile.created_at*1000)) }}</span>
+          <span>{{ formatStandardTime(Math.round(selectedFile.created_at*1000)) }}</span>
         </div>
         <div class="info-item">
           <label>处理状态:</label>
@@ -1033,9 +1033,10 @@ const openFileDetail = (record) => {
   }
 }
 
+// Format relative time with more granularity: days ago, weeks ago, months ago
 const formatRelativeTime = (timestamp, offset = 0) => {
-    // 如果调整为东八区时间（UTC+8），则offset为8，否则为0
-    const timezoneOffset = offset * 60 * 60 * 1000; // 东八区偏移量（毫秒）
+    // If you want to adjust to UTC+8, set offset to 8, otherwise 0
+    const timezoneOffset = offset * 60 * 60 * 1000; // offset in milliseconds
     const adjustedTimestamp = timestamp + timezoneOffset;
 
     const now = Date.now();
@@ -1047,7 +1048,17 @@ const formatRelativeTime = (timestamp, offset = 0) => {
         return Math.round(secondsPast / 60) + ' 分钟前';
     } else if (secondsPast < 86400) {
         return Math.round(secondsPast / 3600) + ' 小时前';
+    } else if (secondsPast < 86400 * 7) {
+        // Less than 7 days
+        return Math.round(secondsPast / 86400) + ' 天前';
+    } else if (secondsPast < 86400 * 30) {
+        // Less than 30 days, show in weeks
+        return Math.round(secondsPast / (86400 * 7)) + ' 周前';
+    } else if (secondsPast < 86400 * 365) {
+        // Less than 1 year, show in months
+        return Math.round(secondsPast / (86400 * 30)) + ' 月前';
     } else {
+        // More than 1 year, show full date
         const date = new Date(adjustedTimestamp);
         const year = date.getFullYear();
         const month = date.getMonth() + 1;
@@ -1056,6 +1067,17 @@ const formatRelativeTime = (timestamp, offset = 0) => {
     }
 }
 
+const formatStandardTime = (timestamp) => {
+  const date = new Date(timestamp);
+  const year = date.getFullYear();
+  const month = date.getMonth() + 1;
+  const day = date.getDate();
+  const hour = date.getHours();
+  const minute = date.getMinutes();
+  const second = date.getSeconds();
+  return `${year} 年 ${month} 月 ${day} 日 ${hour}:${minute}:${second}`;
+}
+
 
 const getDatabaseInfo = () => {
   const db_id = databaseId.value
@@ -1654,6 +1676,15 @@ const columnsCompact = [
     sorter: (a, b) => (a.filename || '').localeCompare(b.filename || ''),
     sortDirections: ['ascend', 'descend']
   },
+  {
+    title: '时间',
+    dataIndex: 'created_at',
+    key: 'created_at',
+    width: 120,
+    align: 'right',
+    sorter: (a, b) => (a.created_at || 0) - (b.created_at || 0),
+    sortDirections: ['ascend', 'descend']
+  },
   {
     title: '状态',
     dataIndex: 'status',
@@ -1666,15 +1697,6 @@ const columnsCompact = [
     },
     sortDirections: ['ascend', 'descend']
   },
-  {
-    title: '时间',
-    dataIndex: 'created_at',
-    key: 'created_at',
-    width: 80,
-    align: 'right',
-    sorter: (a, b) => (a.created_at || 0) - (b.created_at || 0),
-    sortDirections: ['ascend', 'descend']
-  },
   { title: '', key: 'action', dataIndex: 'file_id', width: 40, align: 'center' }
 ];