diff --git a/zh-cn/application-dev/security/cert-guidelines.md b/zh-cn/application-dev/security/cert-guidelines.md
index 05240c1eb3adf66cc3133faa12f674fb99b9e807..e25951555dced38ce3d53290920c97c97b8d8886 100755
--- a/zh-cn/application-dev/security/cert-guidelines.md
+++ b/zh-cn/application-dev/security/cert-guidelines.md
@@ -441,7 +441,7 @@ function crlEntrySample() {
     }
 
     // 获取被吊销证书的序列号
-    let serialNumber = crlEntry.getSerialNumber();
+    serialNumber = crlEntry.getSerialNumber();
     
     // 获取被吊销证书的吊销日期
     try {