diff --git a/tools/get_pr_ut.py b/tools/get_pr_ut.py
index 4c21d59cbe2962eb6adfdc2551d02d4e115b3a1a..d8440ad048939313c696085b2ec59187422b6a83 100644
--- a/tools/get_pr_ut.py
+++ b/tools/get_pr_ut.py
@@ -125,12 +125,16 @@ class PRChecker(object):
         """ Get files in pull request. """
         page = 0
         file_dict = {}
+        file_count = 0
         while True:
             files = self.pr.get_files().get_page(page)
             if not files:
                 break
             for f in files:
                 file_dict[PADDLE_ROOT + f.filename] = f.status
+                file_count += 1
+            if file_count == 30:  #if pr file count = 31, nend to run all case
+                break
             page += 1
         print("pr modify files: %s" % file_dict)
         return file_dict
@@ -282,6 +286,8 @@ class PRChecker(object):
         filterFiles = []
         file_list = []
         file_dict = self.get_pr_files()
+        if len(file_dict) == 30:  #if pr file count = 31, nend to run all case
+            return ''
         for filename in file_dict:
             if filename.startswith(PADDLE_ROOT + 'python/'):
                 file_list.append(filename)