diff --git a/zh-cn/application-dev/database/database-relational-guidelines.md b/zh-cn/application-dev/database/database-relational-guidelines.md
index 0eb66f5cd42022b1cf8ef6475cbcd280e9c2e63f..8eca8036a8632e71797612093f1c510d056da20a 100644
--- a/zh-cn/application-dev/database/database-relational-guidelines.md
+++ b/zh-cn/application-dev/database/database-relational-guidelines.md
@@ -402,7 +402,7 @@
     ```js
     function storeObserver(devices) {
       for (let i = 0; i < devices.length; i++) {
-        console.info(`device= ${device[i]} data changed`);
+        console.info(`device= ${devices[i]} data changed`);
       }
     }