diff --git a/book/chapter-01-run-and-talk.md b/book/chapter-01-run-and-talk.md
index 56dd415c..9cbd814b 100644
--- a/book/chapter-01-run-and-talk.md
+++ b/book/chapter-01-run-and-talk.md
@@ -55,9 +55,6 @@ Notes:
 1. Enter the BotServer root folder.
 2. Run tests by `npm test`.
 
-## Test by PowerShell
-
-![npm test](https://user-images.githubusercontent.com/65977273/94598386-3e977d80-0265-11eb-93e8-ca3013c3f1e1.png)
 
 
 ### Just copy the source code to your machine