diff --git a/sop-sdk/sdk-java/src/main/java/com/gitee/sop/sdk/request/BaseRequest.java b/sop-sdk/sdk-java/src/main/java/com/gitee/sop/sdk/request/BaseRequest.java
index 940c0a51..66a4e6ff 100644
--- a/sop-sdk/sdk-java/src/main/java/com/gitee/sop/sdk/request/BaseRequest.java
+++ b/sop-sdk/sdk-java/src/main/java/com/gitee/sop/sdk/request/BaseRequest.java
@@ -36,10 +36,12 @@ import java.util.Map;
  */
 public abstract class BaseRequest<T extends BaseResponse> {
 
+    private static final String EMPTY_JSON = "{}";
+
     private String method;
     private String version;
 
-    private String bizContent;
+    private String bizContent = EMPTY_JSON;
     private Object bizModel;
 
     /**