diff --git a/src/com/hellogithub/dao/UserDao.java b/src/com/hellogithub/dao/UserDao.java
index 2987b45..930e68f 100644
--- a/src/com/hellogithub/dao/UserDao.java
+++ b/src/com/hellogithub/dao/UserDao.java
@@ -418,6 +418,14 @@ public class UserDao {
             QueryRunner runner = new QueryRunner();
             String sql="delete from user where userId = ?";
             num = runner.update(conn,sql,id);
+            sql="update project set isValid = 0 where userId = ?";
+            runner.update(conn,sql,id);
+            sql="delete from support where userId = ?";
+            runner.update(conn,sql,id);
+            sql="delete from comment where userId = ?";
+            runner.update(conn,sql,id);
+            sql="update article set isValid = 0 where userId = ?";
+            runner.update(conn,sql,id);
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
diff --git a/src/com/hellogithub/dao/commentDao.java b/src/com/hellogithub/dao/commentDao.java
index bcfa25b..c287bb9 100644
--- a/src/com/hellogithub/dao/commentDao.java
+++ b/src/com/hellogithub/dao/commentDao.java
@@ -128,7 +128,7 @@ public class commentDao {
         try {
             Connection conn = JdbcUtils.getConnection();
             QueryRunner runner = new QueryRunner();
-            String sql="update project  set userId = ? , projectId = ? , content = ? ,isUsed =?, commentTime=?, isValid=?,star=?,likeNum=?where commentId =? ";
+            String sql="update comment  set userId = ? , projectId = ? , content = ? ,isUsed =?, commentTime=?, isValid=?,star=?,likeNum=?where commentId =? ";
             num = runner.update(conn,sql,userId,  projectId , content , isUsed, commentTime, isValid, star, likeNum ,commentId);
         } catch (SQLException e) {
             throw new RuntimeException(e);
@@ -142,7 +142,7 @@ public class commentDao {
         try {
             Connection conn = JdbcUtils.getConnection();
             QueryRunner runner = new QueryRunner();
-            String sql="delete from project where commentId = ?";
+            String sql="delete from comment where commentId = ?";
             num = runner.update(conn,sql,id);
         } catch (SQLException e) {
             throw new RuntimeException(e);
diff --git a/src/com/hellogithub/dao/projectDao.java b/src/com/hellogithub/dao/projectDao.java
index d8d9e5e..1113451 100644
--- a/src/com/hellogithub/dao/projectDao.java
+++ b/src/com/hellogithub/dao/projectDao.java
@@ -369,10 +369,12 @@ 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");
+            sql="delete from support where projectId = ?";
+            runner.update(conn,sql,id);
+            sql="delete from project_category where projectId = ?";
+            runner.update(conn,sql,id);
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
diff --git a/src/com/hellogithub/service/projectService.java b/src/com/hellogithub/service/projectService.java
index 5d4df04..4d54c6b 100644
--- a/src/com/hellogithub/service/projectService.java
+++ b/src/com/hellogithub/service/projectService.java
@@ -289,5 +289,12 @@ public class projectService {
     {
         return projectDao.updateProjectDetail( projectId ,  userId ,  projectName,  projectUrl , projectIco , projectTitle , projectDescription , startNum, submitTime ,categoryId,isValid,fileAddress, periodicals, lookCount);
     }
-    public int deleteProject(int id ){return projectDao.deleteProject(id);}
+    public int deleteProject(int id )
+    {
+        int userId = projectDao.selectProById(String.valueOf(id)).getUserId();
+        String userName= userDao.selectNameById(userId);
+        userEntity userEntity = userDao.selectUserByName(userName);
+        userDao.updateUserDetail(userEntity.getUserId(),userName,userEntity.getUserPassword(),userEntity.getCreatTime(),userEntity.getIsValid(),userEntity.getProjectNum()-1,userEntity.getSearchHistory(),userEntity.getContributionValue(),userEntity.getUserAvatar(),userEntity.getUserLevel());
+        return projectDao.deleteProject(id);
+    }
 }
\ No newline at end of file
diff --git a/src/com/hellogithub/servlet/systemAdmin/deleteProjectServlet.java b/src/com/hellogithub/servlet/systemAdmin/deleteProjectServlet.java
index 8161ac2..b9637d3 100644
--- a/src/com/hellogithub/servlet/systemAdmin/deleteProjectServlet.java
+++ b/src/com/hellogithub/servlet/systemAdmin/deleteProjectServlet.java
@@ -35,7 +35,6 @@ public class deleteProjectServlet extends HttpServlet {
 
         String proId = req.getParameter("id");
         PrintWriter writer = resp.getWriter();
-
         int num = projectService.deleteProject(Integer.parseInt(proId));
         if(num == 0)
         {