diff --git a/zh-cn/application-dev/database/database-relational-guidelines.md b/zh-cn/application-dev/database/database-relational-guidelines.md
index 1ad02f9ad5aff7278910260bd21bfe9b3c282c4b..150ef3b831a2d67214e9f815f81716d5bdf5ba90 100644
--- a/zh-cn/application-dev/database/database-relational-guidelines.md
+++ b/zh-cn/application-dev/database/database-relational-guidelines.md
@@ -370,7 +370,7 @@
     ```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`);
       }
     }