diff --git a/.github/pull_request_assignment.yml b/.github/pull_request_assignment.yml
index 62179bc71e3c..c77a094f67ad 100644
--- a/.github/pull_request_assignment.yml
+++ b/.github/pull_request_assignment.yml
@@ -138,6 +138,12 @@
       - "specification/web/**"
     reviewers:
       - weidongxu-microsoft
+      
+- rule:
+    paths:
+      - "specification/testbase/**"
+    reviewers:
+      - PhoenixHe-msft
 
 - rule:
     paths: