diff --git a/adapter/flowable-spring-boot-jpa-starter/src/main/java/com/lanyuanxiaoyao/flowable/jpa/entity/FlowableInstance.java b/adapter/flowable-spring-boot-jpa-starter/src/main/java/com/lanyuanxiaoyao/flowable/jpa/entity/FlowableInstance.java
index 0cb6967..4cf13bf 100644
--- a/adapter/flowable-spring-boot-jpa-starter/src/main/java/com/lanyuanxiaoyao/flowable/jpa/entity/FlowableInstance.java
+++ b/adapter/flowable-spring-boot-jpa-starter/src/main/java/com/lanyuanxiaoyao/flowable/jpa/entity/FlowableInstance.java
@@ -52,12 +52,15 @@ public class FlowableInstance {
   @LastModifiedDate
   private LocalDateTime updatedTime;
 
+  private String extra;
+
   @SneakyThrows
   public FlowableInstance(com.lanyuanxiaoyao.flowable.core.model.FlowableInstance instance) {
     this.instanceId = instance.getInstanceId();
     this.metadata = objectToBytes(instance.getMetadata());
     this.currentNodeId = instance.getCurrentNodeId();
     this.status = instance.getStatus();
+    this.extra = instance.getExtra();
   }
 
   private static byte[] objectToBytes(Object object) throws IOException {
@@ -86,6 +89,7 @@ public class FlowableInstance {
         .status(status)
         .createdTime(createdTime)
         .updatedTime(updatedTime)
+        .extra(extra)
         .build();
   }
 }
diff --git a/flowable-core/src/main/java/com/lanyuanxiaoyao/flowable/core/model/FlowableInstance.java b/flowable-core/src/main/java/com/lanyuanxiaoyao/flowable/core/model/FlowableInstance.java
index 9566209..01cfac6 100644
--- a/flowable-core/src/main/java/com/lanyuanxiaoyao/flowable/core/model/FlowableInstance.java
+++ b/flowable-core/src/main/java/com/lanyuanxiaoyao/flowable/core/model/FlowableInstance.java
@@ -26,6 +26,8 @@ public class FlowableInstance {
   @Builder.Default
   private LocalDateTime updatedTime = LocalDateTime.now();
 
+  private String extra;
+
   public void addMetadata(Map<String, Object> metadata) {
     this.metadata.putAll(metadata);
   }