diff --git a/README.md b/README.md
index 3cbb197..1b9d69e 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,8 @@ Android Notes
 
 [Gralde Plugin 实践之 TinyPng Plugin](https://github.com/Omooo/Android-Notes/blob/master/blogs/Android/Gradle/TinyPngPlugin.md)
 
+[Gradle 详解 Extension](https://github.com/Omooo/Android-Notes/blob/master/blogs/Android/Gradle/Extension.md)
+
 《Android Gradle 权威指南读书笔记》
 
 - [基础知识相关](https://github.com/Omooo/Android-Notes/blob/master/blogs/Android/Gradle/Android%20Gradle%20%E6%9D%83%E5%A8%81%E6%8C%87%E5%8D%97/%E8%AF%BB%E4%B9%A6%E7%AC%94%E8%AE%B0%E4%B9%8B%E4%B8%80.md)
diff --git a/blogs/Android/Gradle/Extension.md b/blogs/Android/Gradle/Extension.md
new file mode 100644
index 0000000..cbb3d06
--- /dev/null
+++ b/blogs/Android/Gradle/Extension.md
@@ -0,0 +1,202 @@
+---
+Extension
+---
+
+#### 目录
+
+1. 简单 Extension
+2. 嵌套 Extension
+3. 嵌套容器 Extension
+
+#### 简单 Extension
+
+```
+student {
+    name 'Omooo'
+    age 18
+    isMale false
+}
+```
+
+```groovy
+class Student {
+    String name
+    int age
+    boolean isMale
+}
+```
+
+```groovy
+project.extensions.create('student', Student.class)
+Student student = project.extensions.getByType(Student.class)
+println(student.name)
+```
+
+#### 嵌套 Extension
+
+```
+student {
+    name 'Omooo'
+    age 18
+    isMale false
+
+    info {
+        qq 2333
+        email '2333@qq.com'
+        isDog true
+    }
+}
+```
+
+```groovy
+class Student {
+    String name
+    int age
+    boolean isMale
+    Info info
+
+    @SuppressWarnings("UnstableApiUsage")
+    Student(ObjectFactory factory) {
+        info = factory.newInstance(Info.class)
+    }
+
+    def info(Action<Info> action) {
+        action.execute(info)
+    }
+
+
+    static class Info {
+        String email
+        int qq
+        boolean isDog
+    }
+}
+```
+
+```groovy
+project.extensions.create('student', Student.class, project.objects)
+Student student = project.extensions.getByType(Student.class)
+println(student.name)
+println(student.info.qq)
+```
+
+#### 嵌套容器 Extension
+
+```
+animal {
+    count 2333
+
+    dog {
+        form 'Animal'
+        isMale false
+    }
+
+    catConfig {
+        shanghaiCat {
+            from 'Shanghai'
+            weight 20000.0f
+        }
+
+        beijingCat {
+            from 'Beijing'
+            weight 300f
+        }
+    }
+}
+```
+
+```groovy
+class Dog {
+    String form
+    boolean isMale
+
+    @Override
+    String toString() {
+        return "Dog{" +
+                "form='" + form + '\'' +
+                ", isMale=" + isMale +
+                '}'
+    }
+}
+```
+
+```groovy
+class Cat {
+    String name
+
+    String from
+    float weight
+
+    Cat(String name) {
+        this.name = name
+    }
+
+    @Override
+    String toString() {
+        return "Cat{" +
+                "name='" + name + '\'' +
+                ", from='" + from + '\'' +
+                ", weight=" + weight +
+                '}'
+    }
+}
+```
+
+```groovy
+class CatExtFactory implements NamedDomainObjectFactory<Cat> {
+
+    private Instantiator instantiator
+
+    CatExtFactory(Instantiator instantiator1) {
+        this.instantiator = instantiator1
+    }
+
+    @Override
+    Cat create(String s) {
+        return instantiator.newInstance(Cat.class, s)
+    }
+}
+```
+
+```groovy
+class Animal {
+    int count
+    Dog dog
+    private NamedDomainObjectContainer<Cat> catContainer
+
+    Animal(Instantiator instantiator,
+           NamedDomainObjectContainer<Cat> catContainer) {
+        this.dog = instantiator.newInstance(Dog.class)
+        this.catContainer = catContainer
+    }
+
+    void dog(Action<Dog> action) {
+        action.execute(dog)
+    }
+
+    void catConfig(Action<? extends NamedDomainObjectContainer<Cat>> action) {
+        action.execute(catContainer)
+    }
+
+    @Override
+    String toString() {
+        return "dog info:" + dog.toString() + "\ncat info:" + catContainer
+    }
+}
+```
+
+```groovy
+        Instantiator instantiator = ((DefaultGradle) project.getGradle())
+                .getServices().get(Instantiator.class)
+        NamedDomainObjectContainer<Cat> catContainer =
+                project.container(Cat.class, new CatExtFactory(instantiator))
+        project.extensions.create('animal', Animal.class, instantiator, catContainer)
+
+        project.task('showAnimalInfo'){
+            doLast{
+                Animal animal = project.extensions.getByName('animal')
+                println(animal.toString())
+            }
+        }
+```
+