diff --git a/mqtt/0301-CONNECT.md b/mqtt/0301-CONNECT.md
index 81c6af3..e4816ff 100644
--- a/mqtt/0301-CONNECT.md
+++ b/mqtt/0301-CONNECT.md
@@ -10,11 +10,39 @@
 
 ##### 图例 3.1 –CONNECT报文的固定报头
 
-| **Bit** | **7**            | **6**           | **5** | **4** | **3** | **2** | **1** | **0** |
-|---------|------------------|-----------------|-------|-------|-------|-------|-------|-------|
-| byte 1  | MQTT报文类型 (1)[7-4] | Reserved 保留位 |
-|         | 0                | 0               | 0     | 1     | 0     | 0     | 0     | 0     |
-| byte 2… | 剩余长度值       |
+<table style="text-align:center">
+   <tr>
+     <td align="center"><strong>Bit</strong></td>
+     <td align="center"><strong>7</strong></td>
+     <td align="center"><strong>6</strong></td>
+     <td align="center"><strong>5</strong></td>
+     <td align="center"><strong>4</strong></td>
+     <td align="center"><strong>3</strong></td>
+     <td align="center"><strong>2</strong></td>
+     <td align="center"><strong>1</strong></td>
+     <td align="center"><strong>0</strong></td>
+   </tr>
+   <tr>
+     <td>byte 1</td>
+     <td colspan="4" align="center">MQTT报文类型 (1)</td>
+     <td colspan="4" align="center">Reserved 保留位</td>
+   </tr>
+   <tr>
+     <td></td>
+      <td align="center">0</td>
+      <td align="center">0</td>
+      <td align="center">0</td>
+      <td align="center">1</td>
+      <td align="center">0</td>
+      <td align="center">0</td>
+      <td align="center">0</td>
+      <td align="center">0</td>
+   </tr>
+   <tr>
+     <td>byte 2...</td>
+     <td colspan="8" align="center">剩余长度</td>
+   </tr>
+ </table>
 
 **剩余长度字段**