diff --git a/escheduler-api/src/main/java/cn/escheduler/api/enums/Status.java b/escheduler-api/src/main/java/cn/escheduler/api/enums/Status.java
index e569390127..6d57da2116 100644
--- a/escheduler-api/src/main/java/cn/escheduler/api/enums/Status.java
+++ b/escheduler-api/src/main/java/cn/escheduler/api/enums/Status.java
@@ -159,6 +159,7 @@ public enum Status {
     NAME_NULL(10134,"name must be not null"),
     NAME_EXIST(10135, "name {0} already exists"),
     SAVE_ERROR(10136, "save error"),
+    DELETE_PROJECT_ERROR_DEFINES_NOT_NULL(10137, "please delete the process definitions in project first!"),
 
 
 
diff --git a/escheduler-api/src/main/java/cn/escheduler/api/service/ProjectService.java b/escheduler-api/src/main/java/cn/escheduler/api/service/ProjectService.java
index 2be8ca4d51..c90d4da779 100644
--- a/escheduler-api/src/main/java/cn/escheduler/api/service/ProjectService.java
+++ b/escheduler-api/src/main/java/cn/escheduler/api/service/ProjectService.java
@@ -20,9 +20,11 @@ import cn.escheduler.api.enums.Status;
 import cn.escheduler.api.utils.Constants;
 import cn.escheduler.api.utils.PageInfo;
 import cn.escheduler.common.enums.UserType;
+import cn.escheduler.dao.mapper.ProcessDefinitionMapper;
 import cn.escheduler.dao.mapper.ProjectMapper;
 import cn.escheduler.dao.mapper.ProjectUserMapper;
 import cn.escheduler.dao.mapper.UserMapper;
+import cn.escheduler.dao.model.ProcessDefinition;
 import cn.escheduler.dao.model.Project;
 import cn.escheduler.dao.model.ProjectUser;
 import cn.escheduler.dao.model.User;
@@ -55,6 +57,9 @@ public class ProjectService extends BaseService{
     @Autowired
     private ProjectUserMapper projectUserMapper;
 
+    @Autowired
+    private ProcessDefinitionMapper processDefinitionMapper;
+
     /**
      * create project
      *
@@ -199,6 +204,12 @@ public class ProjectService extends BaseService{
         if (checkResult != null) {
             return checkResult;
         }
+        List<ProcessDefinition> processDefinitionList = processDefinitionMapper.queryAllDefinitionList(projectId);
+
+        if(processDefinitionList.size() > 0){
+            putMsg(result, Status.DELETE_PROJECT_ERROR_DEFINES_NOT_NULL);
+            return result;
+        }
 
         int delete = projectMapper.delete(projectId);
         if (delete > 0) {