diff --git a/backend/include/database.h b/backend/include/database.hpp
similarity index 100%
rename from backend/include/database.h
rename to backend/include/database.hpp
diff --git a/backend/include/drivearray.h b/backend/include/drivearray.hpp
similarity index 100%
rename from backend/include/drivearray.h
rename to backend/include/drivearray.hpp
diff --git a/backend/include/drivemultimap.h b/backend/include/key2index.hpp
similarity index 100%
rename from backend/include/drivemultimap.h
rename to backend/include/key2index.hpp
diff --git a/backend/src/database.cpp b/backend/src/database.cpp
deleted file mode 100644
index e69de29..0000000
diff --git a/backend/src/drivearray.cpp b/backend/src/drivearray.cpp
deleted file mode 100644
index e69de29..0000000
diff --git a/backend/src/drivemultimap.cpp b/backend/src/drivemultimap.cpp
deleted file mode 100644
index e69de29..0000000
diff --git a/docs/develop/总体设计文档.md b/docs/develop/总体设计文档.md
index 608262a..804f40c 100644
--- a/docs/develop/总体设计文档.md
+++ b/docs/develop/总体设计文档.md
@@ -36,7 +36,7 @@
 能够逻辑上并发地响应需求，并且实际上尽可能并行。每秒可响应1e4次请求。
 ##### 数据结构
 ###### 底层实现
-通过一个逻辑有序、带一层块级索引的块状链表实现一个键值数据库，相当于`std::multimap`，一个键值数据库实例拥有恰好一个文件
+通过一个哈希表实现一个键值数据库，相当于`std::multimap`，一个键值数据库实例拥有恰好一个文件
 ###### 逻辑实现
 数据库的一条记录有主键（应当是唯一的）、副键和数据构成，从主键到数据建立multimap，从副键到主键建立multimap，一个数据库实例拥有恰好两个文件，一个数据库可以有多个Sheet，用于逻辑上存储不同的表。