diff --git a/src/main/java/com/supervision/neo4j/service/impl/Neo4jServiceImpl.java b/src/main/java/com/supervision/neo4j/service/impl/Neo4jServiceImpl.java
index 77c9327..b6d5d95 100644
--- a/src/main/java/com/supervision/neo4j/service/impl/Neo4jServiceImpl.java
+++ b/src/main/java/com/supervision/neo4j/service/impl/Neo4jServiceImpl.java
@@ -92,13 +92,14 @@ public class Neo4jServiceImpl implements Neo4jService {
         try {
             Session session = driver.session();
             StringBuilder cql = new StringBuilder();
-            cql.append("MATCH (n) where id(n) = ").append(id).append(" DETACH DELETE n");
+            cql.append("MATCH (n) where id(n) = ").append(id).append(" DELETE n");
             log.info(cql.toString());
             Result run = session.run(cql.toString());
             while (run.hasNext()) {
                 run.next();
             }
         } catch (Exception e) {
+            //如果报错，说明存在未删除的关系，是合理的
             log.error(e.getMessage(), e);
         }
     }
@@ -108,13 +109,14 @@ public class Neo4jServiceImpl implements Neo4jService {
         try {
             Session session = driver.session();
             StringBuilder cql = new StringBuilder();
-            cql.append("MATCH (n) WHERE id(n) = ").append(id).append(" DETACH DELETE n");
+            cql.append("MATCH (n) WHERE n.id = ").append(id).append(" AND NOT (n)--() DELETE n");
             log.info(cql.toString());
             Result run = session.run(cql.toString());
             while (run.hasNext()) {
                 run.next();
             }
         } catch (Exception e) {
+            //如果报错，说明存在未删除的关系，是合理的
             log.error(e.getMessage(), e);
         }
     }