diff --git a/web_server.go b/web_server.go
index 7d8e52c..57ec456 100644
--- a/web_server.go
+++ b/web_server.go
@@ -112,11 +112,11 @@ func getStationData(w http.ResponseWriter, r *http.Request) {
 		intervalSQL = "1 hour"
 	}
 
-	// 构建查询SQL - 使用时间窗口聚合
+	// 构建查询SQL - 使用时间窗口聚合，显示上一个时间段的数据
 	query = fmt.Sprintf(`
 		WITH time_series AS (
 			SELECT 
-				date_trunc('hour', timestamp) + 
+				date_trunc('hour', timestamp) + INTERVAL '1 hour' + 
 				INTERVAL '%s' * FLOOR(EXTRACT(EPOCH FROM timestamp - date_trunc('hour', timestamp)) / EXTRACT(EPOCH FROM INTERVAL '%s')) as time_bucket,
 				temperature,
 				humidity,