diff --git a/Chapter3-2-6/pom.xml b/Chapter3-2-6/pom.xml
new file mode 100755
index 0000000..a060bc0
--- /dev/null
+++ b/Chapter3-2-6/pom.xml
@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.didispace</groupId>
+	<artifactId>demo</artifactId>
+	<version>1.0.0</version>
+	<packaging>jar</packaging>
+
+	<name>demo</name>
+	<description>Spring Boot project</description>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>1.3.2.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-data-mongodb</artifactId>
+		</dependency>
+
+	</dependencies>
+	
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+
+</project>
diff --git a/Chapter3-2-6/src/main/java/com/didispace/Application.java b/Chapter3-2-6/src/main/java/com/didispace/Application.java
new file mode 100755
index 0000000..2a14b75
--- /dev/null
+++ b/Chapter3-2-6/src/main/java/com/didispace/Application.java
@@ -0,0 +1,13 @@
+package com.didispace;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+}
diff --git a/Chapter3-2-6/src/main/java/com/didispace/domain/User.java b/Chapter3-2-6/src/main/java/com/didispace/domain/User.java
new file mode 100644
index 0000000..bfff180
--- /dev/null
+++ b/Chapter3-2-6/src/main/java/com/didispace/domain/User.java
@@ -0,0 +1,48 @@
+package com.didispace.domain;
+
+import org.springframework.data.annotation.Id;
+
+/**
+ * @author 程序猿DD
+ * @version 1.0.0
+ * @date 16/4/27 下午10:04.
+ * @blog http://blog.didispace.com
+ */
+public class User {
+
+    @Id
+    private Long id;
+
+    private String username;
+    private Integer age;
+
+    public User(Long id, String username, Integer age) {
+        this.id = id;
+        this.username = username;
+        this.age = age;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(Integer age) {
+        this.age = age;
+    }
+}
diff --git a/Chapter3-2-6/src/main/java/com/didispace/domain/UserRepository.java b/Chapter3-2-6/src/main/java/com/didispace/domain/UserRepository.java
new file mode 100644
index 0000000..073231e
--- /dev/null
+++ b/Chapter3-2-6/src/main/java/com/didispace/domain/UserRepository.java
@@ -0,0 +1,15 @@
+package com.didispace.domain;
+
+import org.springframework.data.mongodb.repository.MongoRepository;
+
+/**
+ * @author 程序猿DD
+ * @version 1.0.0
+ * @date 16/4/27 下午10:16.
+ * @blog http://blog.didispace.com
+ */
+public interface UserRepository extends MongoRepository<User, Long> {
+
+    User findByUsername(String username);
+
+}
diff --git a/Chapter3-2-6/src/main/resources/application.properties b/Chapter3-2-6/src/main/resources/application.properties
new file mode 100644
index 0000000..65cdd33
--- /dev/null
+++ b/Chapter3-2-6/src/main/resources/application.properties
@@ -0,0 +1,3 @@
+spring.data.mongodb.uri=mongodb://name:pass@localhost:27017/test
+
+
diff --git a/Chapter3-2-6/src/test/java/com/didispace/ApplicationTests.java b/Chapter3-2-6/src/test/java/com/didispace/ApplicationTests.java
new file mode 100755
index 0000000..d59751c
--- /dev/null
+++ b/Chapter3-2-6/src/test/java/com/didispace/ApplicationTests.java
@@ -0,0 +1,47 @@
+package com.didispace;
+
+import com.didispace.domain.User;
+import com.didispace.domain.UserRepository;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(Application.class)
+public class ApplicationTests {
+
+	@Autowired
+	private UserRepository userRepository;
+
+	@Before
+	public void setUp() {
+		userRepository.deleteAll();
+	}
+
+	@Test
+	public void test() throws Exception {
+
+		// 创建三个User，并验证User总数
+		userRepository.save(new User(1L, "didi", 30));
+		userRepository.save(new User(2L, "mama", 40));
+		userRepository.save(new User(3L, "kaka", 50));
+		Assert.assertEquals(3, userRepository.findAll().size());
+
+		// 删除一个User，再验证User总数
+		User u = userRepository.findOne(1L);
+		userRepository.delete(u);
+		Assert.assertEquals(2, userRepository.findAll().size());
+
+		// 删除一个User，再验证User总数
+		u = userRepository.findByUsername("mama");
+		userRepository.delete(u);
+		Assert.assertEquals(1, userRepository.findAll().size());
+
+	}
+
+}