diff --git a/docs/en/related_documents/establish_serial_connection.md b/docs/en/related_documents/establish_serial_connection.md
index 826004ae..d2bde7a4 100644
--- a/docs/en/related_documents/establish_serial_connection.md
+++ b/docs/en/related_documents/establish_serial_connection.md
@@ -52,7 +52,7 @@
 
 **Choice the version of USB driver according to your windows version(Windows7/8/10).**
 
-<img src="assets/img/getting_started_pics/establish_serial_connection/windows_download_CP2104_USB_driver.</figure>
+<img src="assets/img/getting_started_pics/establish_serial_connection/windows_download_CP2104_USB_driver.png">
 
 **Choice the right version installer(x64/x86), and install it.**
 
@@ -68,4 +68,4 @@
 
 **Figures below show serial port for M5Stack Core board**
 
-<img src="assets/img/getting_started_pics/establish_serial_connection/windows_m5stack_in_device_manager.</figure>
+<img src="assets/img/getting_started_pics/establish_serial_connection/windows_m5stack_in_device_manager.png">