diff --git a/hardware/io/usb.md b/hardware/io/usb.md
index d3df911..05f049e 100644
--- a/hardware/io/usb.md
+++ b/hardware/io/usb.md
@@ -1,9 +1,8 @@
 # USB
 
-
-- ![usb speed](# ../../pic/usb.png)
-- ![usb sign](# ../../pic/usb3.png)
-- ![雷电](# ../../pic/usb2.png)
+- ![usb speed](../../pic/usb.png)
+- ![usb sign](../../pic/usb3.png)
+- ![雷电](../../pic/usb2.png)
 
 ---