diff --git a/README.md b/README.md
index 82737d7..c4312db 100644
--- a/README.md
+++ b/README.md
@@ -331,22 +331,21 @@ $$
 
 ## 9. [排序](ch8/README.md#排序)
 
-- 基本概念
-  - 排序定义
-  - 时空复杂度
-  - 稳定性
-- 内部排序
-  - 插入排序
-    - 直接插入排序
-    - 折半插入排序
-    - 希尔排序
-  - 交换排序
-    - 冒泡排序
-    - 快速排序
-  - 选择排序
-    - 简单选择排序
-    - 堆排序
-  - 归并排序
-  - 基数排序
-- 外部排序
-  - 多路归并排序
+- [基本概念](ch8/README.md#1-基本概念)
+- [内部排序](ch8/README.md#2-内部排序算法)
+  - [插入排序](ch8/README.md#2-内部排序算法)
+    - [直接插入排序](ch8/direct-insertion-sort/README.md#直接插入排序)
+    - [折半插入排序](ch8/binary-insertion-sort/README.md#折半插入排序)
+    - [希尔排序](ch8/shell-sort/README.md#希尔排序)
+  - [交换排序](ch8/README.md#2-内部排序算法)
+    - [冒泡排序](ch8/bubble-sort/README.md#冒泡排序)
+    - [快速排序](ch8/quick-sort/README.md#快速排序)
+  - [选择排序](ch8/README.md#2-内部排序算法)
+    - [简单选择排序](ch8/simple-selection-sort/README.md#简单选择排序)
+    - [堆排序](ch8/heap-sort/README.md#堆排序)
+  - [归并排序](ch8/merge-sort/README.md#归并排序)
+  - [基数排序](ch8/cardinal-sort/README.md#基数排序)
+- [外部排序](ch8/external-sort/README.md#外部排序)
+  - [失败树](external-sort/README.md#1-失败树)
+  - [置换-选择排序](external-sort/README.md#2-置换-选择排序)
+  - [最佳归并树](external-sort/README.md#3-最佳归并树)
diff --git a/ch8/README.md b/ch8/README.md
index e3569f2..6a4f11b 100644
--- a/ch8/README.md
+++ b/ch8/README.md
@@ -1,3 +1,41 @@
 # 排序
 
-## 基本概念
+## 1. 基本概念
+
+- 排序定义
+- 时空复杂度
+- 稳定性
+
+![排序基本概念1](concept1.png)
+
+![排序基本概念2](concept2.png)
+
+![排序基本概念3](concept3.png)
+
+![排序基本概念4](concept4.png)
+
+![排序基本概念5](concept5.png)
+
+## 2. 内部排序算法
+
+- [直接插入排序](direct-insertion-sort/README.md#直接插入排序)
+- [折半插入排序](binary-insertion-sort/README.md#折半插入排序)
+- [希尔排序](shell-sort/README.md#希尔排序)
+- [冒泡排序](bubble-sort/README.md#冒泡排序)
+- [快速排序](quick-sort/README.md#快速排序)
+- [简单选择排序](simple-selection-sort/README.md#简单选择排序)
+- [堆排序](heap-sort/README.md#堆排序)
+- [归并排序](merge-sort/README.md#归并排序)
+- [基数排序](cardinal-sort/README.md#基数排序)
+
+![内部排序算法总结比较1](summary1.png)
+
+![内部排序算法总结比较2](summary2.png)
+
+![内部排序算法总结比较3](summary3.png)
+
+## 3. [外部排序](external-sort/README.md#外部排序)
+
+- [失败树](external-sort/README.md#1-失败树)
+- [置换-选择排序](external-sort/README.md#2-置换-选择排序)
+- [最佳归并树](external-sort/README.md#3-最佳归并树)
diff --git a/ch8/binary-insertion-sort/README.md b/ch8/binary-insertion-sort/README.md
new file mode 100644
index 0000000..881ea76
--- /dev/null
+++ b/ch8/binary-insertion-sort/README.md
@@ -0,0 +1,5 @@
+# 折半插入排序
+
+![折半插入排序1](bis1.png)
+
+![折半插入排序2](bis2.png)
diff --git a/ch8/binary-insertion-sort/bis1.png b/ch8/binary-insertion-sort/bis1.png
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diff --git a/ch8/bubble-sort/README.md b/ch8/bubble-sort/README.md
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--- /dev/null
+++ b/ch8/bubble-sort/README.md
@@ -0,0 +1,5 @@
+# 冒泡排序
+
+![冒泡排序1](bs1.png)
+
+![冒泡排序2](bs2.png)
diff --git a/ch8/bubble-sort/bs1.png b/ch8/bubble-sort/bs1.png
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diff --git a/ch8/cardinal-sort/README.md b/ch8/cardinal-sort/README.md
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+++ b/ch8/cardinal-sort/README.md
@@ -0,0 +1,13 @@
+# 基数排序
+
+![基数排序1](cs1.png)
+
+![基数排序2](cs2.png)
+
+![基数排序3](cs3.png)
+
+![基数排序4](cs4.png)
+
+![基数排序5](cs5.png)
+
+![基数排序6](cs6.png)
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+# 直接插入排序
+
+![直接插入排序1](dis1.png)
+
+![直接插入排序2](dis2.png)
+
+![直接插入排序3](dis3.png)
+
+![直接插入排序4](dis4.png)
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@@ -0,0 +1,39 @@
+# 外部排序
+
+![外部排序1](es1.png)
+
+![外部排序2](es2.png)
+
+![外部排序3](es3.png)
+
+![外部排序4](es4.png)
+
+![外部排序5](es5.png)
+
+![外部排序6](es6.png)
+
+## 1. 失败树
+
+![失败树1](ft1.png)
+
+![失败树2](ft2.png)
+
+## 2. 置换-选择排序
+
+![置换-选择排序1](pss1.png)
+
+![置换-选择排序2](pss2.png)
+
+## 3. 最佳归并树
+
+![最佳归并树1](bmt1.png)
+
+![最佳归并树2](bmt2.png)
+
+![最佳归并树3](bmt3.png)
+
+![最佳归并树4](bmt4.png)
+
+![最佳归并树5](bmt5.png)
+
+![最佳归并树6](bmt6.png)
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+# 堆排序
+
+![堆排序1](hs1.png)
+
+![堆排序2](hs2.png)
+
+![堆排序3](hs3.png)
+
+![堆排序4](hs4.png)
+
+![堆排序5](hs5.png)
+
+![堆排序6](hs6.png)
+
+![堆排序7](hs7.png)
+
+![堆排序8](hs8.png)
+
+![堆排序9](hs9.png)
+
+![堆排序10](hs10.png)
+
+![堆排序11](hs11.png)
+
+![堆排序12](hs12.png)
+
+![堆排序13](hs13.png)
+
+![堆排序14](hs14.png)
+
+![堆排序15](hs15.png)
+
+![堆排序16](hs16.png)
+
+![堆排序17](hs17.png)
+
+![堆排序18](hs18.png)
+
+![堆排序19](hs19.png)
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+# 归并排序
+
+![归并排序1](ms1.png)
+
+![归并排序2](ms2.png)
+
+![归并排序3](ms3.png)
+
+![归并排序4](ms4.png)
+
+![归并排序5](ms5.png)
+
+![归并排序6](ms6.png)
+
+![归并排序7](ms7.png)
+
+![归并排序8](ms8.png)
+
+![归并排序9](ms9.png)
+
+![归并排序10](ms10.png)
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+# 快速排序
+
+![快速排序1](qs1.png)
+
+![快速排序2](qs2.png)
+
+![快速排序3](qs3.png)
+
+![快速排序4](qs4.png)
+
+![快速排序5](qs5.png)
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+# 希尔排序
+
+![希尔排序1](ss1.png)
+
+![希尔排序2](ss2.png)
+
+![希尔排序3](ss3.png)
+
+![希尔排序4](ss4.png)
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+# 简单选择排序
+
+![简单选择排序1](sss1.png)
+
+![简单选择排序2](sss2.png)
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