diff --git a/whatsmars-earth/whatsmars-earth-dao/src/main/java/org/hongxi/whatsmars/earth/dao/UserDao.java b/whatsmars-earth/whatsmars-earth-dao/src/main/java/org/hongxi/whatsmars/earth/dao/UserDao.java
index 2b22432f..3eb525ad 100644
--- a/whatsmars-earth/whatsmars-earth-dao/src/main/java/org/hongxi/whatsmars/earth/dao/UserDao.java
+++ b/whatsmars-earth/whatsmars-earth-dao/src/main/java/org/hongxi/whatsmars/earth/dao/UserDao.java
@@ -7,6 +7,8 @@
  */
 public interface UserDao {
 
+    void createIfNotExistsTable();
+
     User findByUsername(String username);
 
     void insert(User user);
diff --git a/whatsmars-earth/whatsmars-earth-dao/src/main/java/org/hongxi/whatsmars/earth/dao/impl/UserDaoImpl.java b/whatsmars-earth/whatsmars-earth-dao/src/main/java/org/hongxi/whatsmars/earth/dao/impl/UserDaoImpl.java
index 437b8740..620c22f2 100644
--- a/whatsmars-earth/whatsmars-earth-dao/src/main/java/org/hongxi/whatsmars/earth/dao/impl/UserDaoImpl.java
+++ b/whatsmars-earth/whatsmars-earth-dao/src/main/java/org/hongxi/whatsmars/earth/dao/impl/UserDaoImpl.java
@@ -7,6 +7,11 @@
  * Created by javahongxi on 2017/12/24.
  */
 public class UserDaoImpl extends BaseDao implements UserDao {
+    @Override
+    public void createIfNotExistsTable() {
+        this.sqlSession.update("User.createIfNotExistsTable");
+    }
+
     @Override
     public User findByUsername(String username) {
         return this.sqlSession.selectOne("User.findByUsername", username);
diff --git a/whatsmars-earth/whatsmars-earth-dao/src/main/resources/sqlmap/User-mapper.xml b/whatsmars-earth/whatsmars-earth-dao/src/main/resources/sqlmap/User-mapper.xml
index da3d1ce7..b940923e 100644
--- a/whatsmars-earth/whatsmars-earth-dao/src/main/resources/sqlmap/User-mapper.xml
+++ b/whatsmars-earth/whatsmars-earth-dao/src/main/resources/sqlmap/User-mapper.xml
@@ -2,6 +2,10 @@
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="User">
 
+    <update id="createIfNotExistsTable">
+        CREATE TABLE IF NOT EXISTS user (id BIGINT AUTO_INCREMENT, username VARCHAR(20) NOT NULL, nickname VARCHAR(20), gender TINYINT, age INT, create_date DATETIME, update_date DATETIME, PRIMARY KEY (id));
+    </update>
+
     <select id="findByUsername" parameterType="string" resultType="User">
         select * from user where username = #username#
     </select>
diff --git a/whatsmars-earth/whatsmars-earth-service/src/main/java/org/hongxi/whatsmars/earth/service/impl/UserServiceImpl.java b/whatsmars-earth/whatsmars-earth-service/src/main/java/org/hongxi/whatsmars/earth/service/impl/UserServiceImpl.java
index 99af9f21..22a748d7 100644
--- a/whatsmars-earth/whatsmars-earth-service/src/main/java/org/hongxi/whatsmars/earth/service/impl/UserServiceImpl.java
+++ b/whatsmars-earth/whatsmars-earth-service/src/main/java/org/hongxi/whatsmars/earth/service/impl/UserServiceImpl.java
@@ -20,6 +20,7 @@ public User findByUsername(String username) {
 
     @Override
     public void add(User user) {
+        userDao.createIfNotExistsTable(); // test
         userDao.insert(user);
     }