diff --git a/docs-en/readme/testing-subsystem.md b/docs-en/readme/testing-subsystem.md
index bb2f779f1cf101b84231dbcad536c875cd9d7a40..2f6c6ffe4eb05c363ab3d1884723f90a4cbc22b8 100755
--- a/docs-en/readme/testing-subsystem.md
+++ b/docs-en/readme/testing-subsystem.md
@@ -130,7 +130,7 @@ Test tool environment dependency
 
 Depend on the Python environment.
 
-Install the serial port plugins  **pyserial**  and  **readline**  on the local Python, and run the  **pip intall pyserial**  and  **sudo apt-get install libreadline-dev**  commands on the shell. The following figure is displayed when the installation is complete.
+Install the serial port plugins  **pyserial**  and  **readline**  on the local Python, and run the  **pip install pyserial**  and  **sudo apt-get install libreadline-dev**  commands on the shell. The following figure is displayed when the installation is complete.
 
 ![](figures/en-us_image_0000001052278423.png)