diff --git a/telegram/tg-bot.js b/telegram/tg-bot.js
index b3ad5f5..e9b864d 100644
--- a/telegram/tg-bot.js
+++ b/telegram/tg-bot.js
@@ -246,15 +246,45 @@ async function handleUserDelete(msg, u, env) {
         });
     }
 
-    const targetMsgId = msg.reply_to_message.message_id.toString();
-    console.log(`Delete request: user=${u.user_id}, target_msg=${targetMsgId}`);
+    const targetMsgIdRaw = msg.reply_to_message.message_id;
+    const targetMsgId = targetMsgIdRaw.toString();
+    console.log(`Delete request: user=${u.user_id}, target_msg_raw=${targetMsgIdRaw} (type: ${typeof targetMsgIdRaw}), target_msg_str=${targetMsgId}`);
     
-    // 查询对应的管理员侧消息ID
-    const ref = await sql(env, "SELECT topic_message_id FROM messages WHERE user_id=? AND message_id=?", [u.user_id, targetMsgId], 'first');
+    // 查询对应的管理员侧消息ID - 尝试多种可能的格式
+    let ref = await sql(env, "SELECT topic_message_id FROM messages WHERE user_id=? AND message_id=?", [u.user_id, targetMsgId], 'first');
+    
+    // 如果没找到，尝试用整数查询（以防数据库中存的是数字）
+    if (!ref || !ref.topic_message_id) {
+        console.log(`First query failed, trying with integer...`);
+        ref = await sql(env, "SELECT topic_message_id FROM messages WHERE user_id=? AND message_id=?", [u.user_id, parseInt(targetMsgId)], 'first');
+    }
     
     if (!ref || !ref.topic_message_id) {
         console.log(`Delete failed: No mapping found for user=${u.user_id}, msg=${targetMsgId}`);
-        console.log(`Tip: Check if the message was forwarded successfully and exists in database`);
+        
+        // 检查是否是管理员发送的消息（通过反向查询）
+        const adminRef = await sql(env, "SELECT user_id FROM messages WHERE topic_message_id=?", [targetMsgId], 'first');
+        if (adminRef) {
+            console.log(`Delete blocked: User tried to delete admin's message (topic_msg=${targetMsgId})`);
+            return api(env.BOT_TOKEN, "sendMessage", {
+                chat_id: u.user_id,
+                text: "❌ 您只能删除自己发送的消息，无法删除管理员回复的消息",
+                reply_to_message_id: msg.message_id
+            });
+        }
+        
+        console.log(`Tip: Check database records with: SELECT * FROM messages WHERE user_id='${u.user_id}'`);
+        
+        // 帮助用户排查：列出该用户的最近5条消息记录
+        try {
+            const recentMsgs = await sql(env, "SELECT message_id, topic_message_id, text FROM messages WHERE user_id=? ORDER BY date DESC LIMIT 5", [u.user_id], 'all');
+            if (recentMsgs && recentMsgs.results) {
+                console.log(`Recent messages for user ${u.user_id}:`, JSON.stringify(recentMsgs.results));
+            }
+        } catch (e) {
+            console.log(`Failed to fetch recent messages:`, e.message);
+        }
+        
         return api(env.BOT_TOKEN, "sendMessage", {
             chat_id: u.user_id,
             text: "❌ 未找到对应的消息记录，可能该消息未被转发或已被删除",