diff --git a/backend/src/main/java/com/qqchen/deploy/backend/workflow/service/INodeInstanceService.java b/backend/src/main/java/com/qqchen/deploy/backend/workflow/service/INodeInstanceService.java
new file mode 100644
index 00000000..b2fa3d1c
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/workflow/service/INodeInstanceService.java
@@ -0,0 +1,40 @@
+package com.qqchen.deploy.backend.workflow.service;
+
+import com.qqchen.deploy.backend.framework.service.IBaseService;
+import com.qqchen.deploy.backend.workflow.api.dto.NodeInstanceDTO;
+import com.qqchen.deploy.backend.workflow.entity.NodeInstance;
+import java.util.List;
+
+/**
+ * 节点实例服务接口
+ */
+public interface INodeInstanceService extends IBaseService<NodeInstance, NodeInstanceDTO, Long> {
+    
+    /**
+     * 根据工作流实例ID查询节点实例列表
+     *
+     * @param workflowInstanceId 工作流实例ID
+     * @return 节点实例列表
+     */
+    List<NodeInstanceDTO> findByWorkflowInstanceId(Long workflowInstanceId);
+
+    /**
+     * 根据工作流实例ID和状态查询节点实例列表
+     *
+     * @param workflowInstanceId 工作流实例ID
+     * @param status 状态
+     * @return 节点实例列表
+     */
+    List<NodeInstanceDTO> findByWorkflowInstanceIdAndStatus(Long workflowInstanceId, String status);
+
+    /**
+     * 更新节点状态
+     *
+     * @param id 节点实例ID
+     * @param status 状态
+     * @param output 输出结果
+     * @param error 错误信息
+     * @return 是否成功
+     */
+    boolean updateStatus(Long id, String status, String output, String error);
+} 
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