diff --git a/src/main/java/com/github/ontio/explorer/statistics/mapper/BadNodeMapper.java b/src/main/java/com/github/ontio/explorer/statistics/mapper/BadNodeMapper.java
new file mode 100644
index 0000000..46aab3d
--- /dev/null
+++ b/src/main/java/com/github/ontio/explorer/statistics/mapper/BadNodeMapper.java
@@ -0,0 +1,11 @@
+package com.github.ontio.explorer.statistics.mapper;
+
+import com.github.ontio.explorer.statistics.model.BadNode;
+import org.springframework.stereotype.Repository;
+import tk.mybatis.mapper.common.Mapper;
+
+
+@Repository
+public interface BadNodeMapper extends Mapper<BadNode> {
+
+}
\ No newline at end of file
diff --git a/src/main/java/com/github/ontio/explorer/statistics/model/BadNode.java b/src/main/java/com/github/ontio/explorer/statistics/model/BadNode.java
new file mode 100644
index 0000000..f98dc9c
--- /dev/null
+++ b/src/main/java/com/github/ontio/explorer/statistics/model/BadNode.java
@@ -0,0 +1,27 @@
+package com.github.ontio.explorer.statistics.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import javax.persistence.Column;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+import javax.persistence.Table;
+
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+@Table(name = "tbl_bad_node")
+public class BadNode {
+    @Id
+    @GeneratedValue(generator = "JDBC")
+    private Integer id;
+
+    @Column(name = "public_key")
+    private String publicKey;
+
+    private Integer cycle;
+}
\ No newline at end of file
diff --git a/src/main/java/com/github/ontio/explorer/statistics/service/ConsensusNodeService.java b/src/main/java/com/github/ontio/explorer/statistics/service/ConsensusNodeService.java
index 1a5837e..9752f00 100644
--- a/src/main/java/com/github/ontio/explorer/statistics/service/ConsensusNodeService.java
+++ b/src/main/java/com/github/ontio/explorer/statistics/service/ConsensusNodeService.java
@@ -79,6 +79,8 @@ public class ConsensusNodeService {
 
     private BlockMapper blockMapper;
 
+    private BadNodeMapper badNodeMapper;
+
     @Autowired
     public ConsensusNodeService(ParamsConfig paramsConfig,
                                 ObjectMapper objectMapper,
@@ -95,7 +97,8 @@ public ConsensusNodeService(ParamsConfig paramsConfig,
                                 InspireCalculationParamsMapper inspireCalculationParamsMapper,
                                 TxEventLogMapper txEventLogMapper,
                                 NodeCycleMapper nodeCycleMapper,
-                                BlockMapper blockMapper) {
+                                BlockMapper blockMapper,
+                                BadNodeMapper badNodeMapper) {
         this.paramsConfig = paramsConfig;
         this.ontSdkService = ontSdkService;
         this.objectMapper = objectMapper;
@@ -112,6 +115,7 @@ public ConsensusNodeService(ParamsConfig paramsConfig,
         this.txEventLogMapper = txEventLogMapper;
         this.nodeCycleMapper = nodeCycleMapper;
         this.blockMapper = blockMapper;
+        this.badNodeMapper = badNodeMapper;
     }
 
     public void updateBlockCountToNextRound() {
@@ -1076,10 +1080,18 @@ public void updateNodeState() {
             Example example = new Example(NodeInfoOffChain.class);
             example.createCriteria().andEqualTo("publicKey", publicKey);
             NodeInfoOffChain entity = nodeInfoOffChainMapper.selectOneByExample(example);
+            Integer badActorBefore = entity.getBadActor();
             entity.setFeeSharingRatio(stable);
             entity.setBadActor(badActor);
             entity.setRisky(risky);
             nodeInfoOffChainMapper.updateByPrimaryKeySelective(entity);
+
+            if (badActor == 1 && badActorBefore == 0) {
+                BadNode badNode = new BadNode();
+                badNode.setPublicKey(publicKey);
+                badNode.setCycle(currentCycle);
+                badNodeMapper.insertSelective(badNode);
+            }
         }
     }
 }