diff --git a/UserDao.xml b/UserDao.xml
new file mode 100644
index 0000000..b3ba308
--- /dev/null
+++ b/UserDao.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.forum.dao.UserDao">
+    <update id="update">
+        update user set password=#{password} where username=#{username}
+    </update>
+
+    <select id="queryByUsernameAndPassword" resultType="com.forum.entity.User">
+        select * from user
+        where username = #{username} and password = #{password};
+    </select>
+
+    <insert id="addUser" parameterType="user">
+        insert into user(username,password,email,create_time,update_time,type,school,avatar)
+        values(#{username},#{password},#{email},#{createTime},#{updateTime},#{type},#{school},#{avatar})
+    </insert>
+    <select id="getAllUser" resultType="com.forum.entity.User">
+        select id,username,password,email,create_time,type from user
+    </select>
+    <delete id="deleteUser" >
+        delete from user where id = #{id}
+    </delete>
+    <select id="count" resultType="Integer" >
+        select count(*) from user where type = 0
+    </select>
+</mapper>