diff --git a/src/com/hellogithub/dao/projectDao.java b/src/com/hellogithub/dao/projectDao.java
index 4957191..d8d9e5e 100644
--- a/src/com/hellogithub/dao/projectDao.java
+++ b/src/com/hellogithub/dao/projectDao.java
@@ -369,8 +369,10 @@ public class projectDao {
         try {
             Connection conn = JdbcUtils.getConnection();
             QueryRunner runner = new QueryRunner();
+            runner.update(conn,"set foreign_key_checks = 0");
             String sql="delete from project where projectId = ?";
             num = runner.update(conn,sql,id);
+            runner.update(conn,"set foreign_key_checks = 1");
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }