diff --git a/ComputerOrganization/README.md b/ComputerOrganization/README.md
index 23d6c94f87b31383b561d6335e3304ce71d09241..bc747b23edd0ece7a274484537016b1b865f8c01 100755
--- a/ComputerOrganization/README.md
+++ b/ComputerOrganization/README.md
@@ -1,25 +1,25 @@
 # 第1章
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter1/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter1/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter1/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter1/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter1/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter1/answer.md)
 
 # 第2章
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter2/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter2/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter2/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter2/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter2/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter2/answer.md)
 
 # 第3章（暂缺）
 
 # 第4章
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter4/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter4/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter4/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter4/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter4/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter4/answer.md)
 
 # 第5章
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter5/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter5/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/ComputerOrganization/Chapter5/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter5/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter5/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/ComputerOrganization/Chapter5/answer.md)
diff --git a/OperatingSystem/README.md b/OperatingSystem/README.md
index 74994fbbc034240a8d96a9c607bf55a083bf1bce..b11be66e859e89587cbb98ca439ddaba17f638e7 100755
--- a/OperatingSystem/README.md
+++ b/OperatingSystem/README.md
@@ -2,42 +2,42 @@
 
 # 第一章：概论
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter1/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter1/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter1/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter1/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter1/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter1/answer.md)
 
 # 第二章：进程
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter2/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter2/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter2/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter2/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter2/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter2/answer.md)
 
 # 第三章：处理机与进程
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter3/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter3/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter3/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter3/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter3/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter3/answer.md)
 
 # 第四章：存储器管理
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter4/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter4/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter4/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter4/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter4/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter4/answer.md)
 
 # 第五章：虚拟存储器
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter5/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter5/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter5/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter5/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter5/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter5/answer.md)
 
 # 第六章：输入输出系统
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter6/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter6/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter6/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter6/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter6/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter6/answer.md)
 
 # 第七章：文件管理
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter7/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter7/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/OperatingSystem/Chapter7/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter7/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter7/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/OperatingSystem/Chapter7/answer.md)
diff --git a/Spring/README.md b/Spring/README.md
index 944643f343a30469244834691bc2e0f6bd077501..db417eb1206267c12a257ba2ca6efd0f83418e87 100755
--- a/Spring/README.md
+++ b/Spring/README.md
@@ -3,46 +3,46 @@
 # 目录
 
 ## 第1章：`Spring`简介
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter1/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter1/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter1/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter1/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter1/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter1/answer.md)
 
 
 ## 第2章：`IoC`+`DI`
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter2/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter2/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter2/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter2/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter2/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter2/answer.md)
 
 
 ## 第3章：`Bean`
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter3/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter3/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter3/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter3/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter3/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter3/answer.md)
 
 
 ## 第4章：`AOP`
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter4/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter4/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter4/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter4/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter4/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter4/answer.md)
 
 
 ## 第5章：`JDBCTemplate`+事务管理
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter5/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter5/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter5/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter5/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter5/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter5/answer.md)
 
 ## 第6章：`MyBatis`集成
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter6/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter6/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter6/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter6/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter6/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter6/answer.md)
 
 ## 第7章：`MyBatis`映射器+动态`SQL`
 
-- [内容](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter7/README.md)
-- [习题](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter7/exercise.md)
-- [参考解答](https://github.com/2293736867/CSBookNotes/blob/master/Spring/Chapter7/answer.md)
+- [内容](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter7/README.md)
+- [习题](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter7/exercise.md)
+- [参考解答](https://github.com/2293736867/CSBookNotes/blob/main/Spring/Chapter7/answer.md)