diff --git a/das/src/main/java/com/das/modules/data/domain/DeviceEventInfo.java b/das/src/main/java/com/das/modules/data/domain/DeviceEventInfo.java
index b9a983e8..86d06672 100644
--- a/das/src/main/java/com/das/modules/data/domain/DeviceEventInfo.java
+++ b/das/src/main/java/com/das/modules/data/domain/DeviceEventInfo.java
@@ -21,7 +21,6 @@ public class DeviceEventInfo {
 
     private String confirmAccount;
 
-    @JsonSerialize(using = ToStringSerializer.class)
     private Long confirmTime;
 
     private String deviceId;