diff --git a/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/Bird.java b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/Bird.java
new file mode 100644
index 0000000..207debb
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/Bird.java
@@ -0,0 +1,19 @@
+package top.fjy8018.designpattern.principle.interfacesegregation.after;
+
+/**
+ * 实现类可以实现需要的接口
+ *
+ * @author F嘉阳
+ * @date 2018-09-22 11:43
+ */
+public class Bird implements IFlyAction, IEatAction {
+    @Override
+    public void eat() {
+
+    }
+
+    @Override
+    public void fly() {
+
+    }
+}
diff --git a/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/Dog.java b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/Dog.java
new file mode 100644
index 0000000..cc6f9cb
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/Dog.java
@@ -0,0 +1,20 @@
+package top.fjy8018.designpattern.principle.interfacesegregation.after;
+
+/**
+ * 接口隔离注重接口方法之间的关系
+ * 单一职责关心类、方法、接口承担的职责，即一个接口只要职责单一就不关系方法之间的关系
+ *
+ * @author F嘉阳
+ * @date 2018-09-22 11:44
+ */
+public class Dog implements IEatAction, ISwimAction {
+    @Override
+    public void eat() {
+
+    }
+
+    @Override
+    public void swim() {
+
+    }
+}
diff --git a/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/IEatAction.java b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/IEatAction.java
new file mode 100644
index 0000000..dbfaa37
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/IEatAction.java
@@ -0,0 +1,11 @@
+package top.fjy8018.designpattern.principle.interfacesegregation.after;
+
+/**
+ * 隔离接口方法，但注意适度，不是越少越好
+ *
+ * @author F嘉阳
+ * @date 2018-09-22 11:42
+ */
+public interface IEatAction {
+    void eat();
+}
diff --git a/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/IFlyAction.java b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/IFlyAction.java
new file mode 100644
index 0000000..920979f
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/IFlyAction.java
@@ -0,0 +1,9 @@
+package top.fjy8018.designpattern.principle.interfacesegregation.after;
+
+/**
+ * @author F嘉阳
+ * @date 2018-09-22 11:43
+ */
+public interface IFlyAction {
+    void fly();
+}
diff --git a/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/ISwimAction.java b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/ISwimAction.java
new file mode 100644
index 0000000..a4bb218
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/after/ISwimAction.java
@@ -0,0 +1,9 @@
+package top.fjy8018.designpattern.principle.interfacesegregation.after;
+
+/**
+ * @author F嘉阳
+ * @date 2018-09-22 11:43
+ */
+public interface ISwimAction {
+    void swim();
+}
diff --git a/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/before/Bird.java b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/before/Bird.java
new file mode 100644
index 0000000..9194433
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/before/Bird.java
@@ -0,0 +1,22 @@
+package top.fjy8018.designpattern.principle.interfacesegregation.before;
+
+/**
+ * @author F嘉阳
+ * @date 2018-09-22 11:41
+ */
+public class Bird implements IAnimalAction {
+    @Override
+    public void eat() {
+
+    }
+
+    @Override
+    public void fly() {
+
+    }
+
+    @Override
+    public void swim() {
+        // 不需要的接口，但被迫实现
+    }
+}
diff --git a/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/before/Dog.java b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/before/Dog.java
new file mode 100644
index 0000000..95f7941
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/before/Dog.java
@@ -0,0 +1,22 @@
+package top.fjy8018.designpattern.principle.interfacesegregation.before;
+
+/**
+ * @author F嘉阳
+ * @date 2018-09-22 11:44
+ */
+public class Dog implements IAnimalAction {
+    @Override
+    public void eat() {
+
+    }
+
+    @Override
+    public void fly() {
+        // 不需要的接口，但被迫实现
+    }
+
+    @Override
+    public void swim() {
+
+    }
+}
diff --git a/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/before/IAnimalAction.java b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/before/IAnimalAction.java
new file mode 100644
index 0000000..a1b79b9
--- /dev/null
+++ b/src/main/java/top/fjy8018/designpattern/principle/interfacesegregation/before/IAnimalAction.java
@@ -0,0 +1,16 @@
+package top.fjy8018.designpattern.principle.interfacesegregation.before;
+
+/**
+ * 接口隔离原则：客户端不应该依赖它不需要的接口；一个类对另一个类的依赖应该建立在最小的接口上
+ * 旧版：一个接口承担过多功能，使得实现类对有些不需要的方法也必须实现
+ *
+ * @author F嘉阳
+ * @date 2018-09-22 11:40
+ */
+public interface IAnimalAction {
+    void eat();
+
+    void fly();
+
+    void swim();
+}