diff --git a/ci/jenkins/Jenkinsfile b/ci/jenkins/Jenkinsfile
index 7c2d83ba59..67bff5ac1e 100644
--- a/ci/jenkins/Jenkinsfile
+++ b/ci/jenkins/Jenkinsfile
@@ -1,13 +1,13 @@
 String cron_timezone = "TZ=Asia/Shanghai"
-String cron_string = BRANCH_NAME == "master" ? "H 0 * * *" : ""
-cron_string =  BRANCH_NAME == "0.5.1" ? "H 1 * * *" : cron_string
+String cron_string = BRANCH_NAME == "master" ? "H 0 * * * " : ""
+cron_string =  BRANCH_NAME == "0.5.1" ? "H 1 * * * " : cron_string
 
 pipeline {
     agent none
 
     triggers {
-        cron('''"${cron_timezone}"
-            "${cron_string}"''')
+        cron """${cron_timezone}
+            ${cron_string}"""
     }
 
     options {