diff --git a/back/src/com/demo/users/UpdateUsers.java b/back/src/com/demo/users/UpdateUsers.java
new file mode 100644
index 0000000..13db8c7
--- /dev/null
+++ b/back/src/com/demo/users/UpdateUsers.java
@@ -0,0 +1,65 @@
+package com.demo.users;
+
+import java.io.IOException;
+
+import java.io.PrintWriter;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import com.Dao.Dao;
+import com.domain.GetDBConnection;
+import com.domain.SqlStr;
+import com.domain.TypeFlag;
+import com.domain.Types;
+
+/**
+ * Servlet implementation class UpdateServlet
+ */
+@WebServlet("/update-servlet")
+public class UpdateUsers extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+       
+    /**
+     * @see HttpServlet#HttpServlet()
+     */
+    public UpdateUsers() {
+        super();
+        // TODO Auto-generated constructor stub
+    }
+
+	/**
+	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
+	 */
+	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+		// TODO Auto-generated method stub
+		
+			 String password = request.getParameter("password");
+			 password = new String(password.getBytes("iso8859-1"),"UTF-8");
+			 String username = request.getParameter("username");
+			 username = new String(username.getBytes("iso8859-1"),"UTF-8");
+			 Dao usersdao=new Dao();
+			 Types type=new Types();
+			 type.setUsername(username);
+			 type.setPassword(password);
+			 PrintWriter out = response.getWriter();
+			if(!usersdao.updateUsers(type,TypeFlag.types,SqlStr.updateusers)) {
+				response.sendError(204, "insert failed");
+				out.println("update failed");
+			}else{
+				out.println("update success");
+			}
+	}
+
+}