diff --git a/README.md b/README.md
index c384ae2..3cb6c3e 100644
--- a/README.md
+++ b/README.md
@@ -91,27 +91,27 @@ https://github.com/superconvert/smart-os
 |       +------------------------------------------------+       |       +-------------------------+       |       +-------------------------+       |  
 |       |             Newwork Protocol Stack             |       |       |  Newwork Protocol Stack |       |       |  Newwork Protocol Stack |       |  
 |       +------------------------------------------------+       |       +-------------------------+       |       +-------------------------+       |  
-|               ↑                    ↑                          |                   ↑                     |                    ↑                    |
+|               +                    +                           |                   +                     |                    +                    |
 |...............|....................|...........................|...................|.....................|....................|....................|
-|               ↓                    ↓                           |                   ↓                     |                    ↓                    |
+|               +                    +                           |                   +                     |                    +                    |
 |        +-------------+    +---------------+                    |           +---------------+             |            +---------------+            |
 |        | 192.168.0.3 |    | 192.168.100.1 |                    |           | 192.168.100.6 |             |            | 192.168.100.8 |            |
 |        +-------------+    +---------------+     +-------+      |           +---------------+             |            +---------------+            |
 |        |     eth0    |    |      br0      |<--->|  tap0 |      |           |      eth0     |             |            |      eth0     |            |
 |        +-------------+    +---------------+     +-------+      |           +---------------+             |            +---------------+            |
-|               ↑                   ↑                 ↑          |                   ↑                     |                    ↑                    |
-|               |                   |                 +------------------------------+                     |                    |                    |
-|               |                   ↓                            |                                         |                    |                    |
+|               +                   +                 +          |                   +                     |                    +                    |
+|               |                   |                 |------------------------------|                     |                    |                    |
+|               |                   +                            |                                         |                    |                    |
 |               |               +-------+                        |                                         |                    |                    |
 |               |               |  tap1 |                        |                                         |                    |                    |
 |               |               +-------+                        |                                         |                    |                    |
-|               |                   ↑                            |                                         |                    |                    |
+|               |                   +                            |                                         |                    |                    |
 |               |                   +----------------------------------------------------------------------|--------------------+                    |
 |               |                                                |                                         |                                         |
 |               |                                                |                                         |                                         |
 |               |                                                |                                         |                                         |
 +---------------|------------------------------------------------+-----------------------------------------+-----------------------------------------+
-                ↓
+                +
      Physical Network  (192.168.0.0/24)
 ```