diff --git a/Cargo.toml b/Cargo.toml
index 88264ee6bdf172d927f84af0bd38575d758c6dc6..7b77544452777e14c746dc56715b2fa8e169f87e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,10 @@ name = "level_db_rust"
 version = "0.1.0"
 edition = "2021"
 
+[lib]
+name = "level_db_rust"
+path = "src/lib.rs"
+
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
diff --git a/README.md b/README.md
index a5983740c541666a593e5ed9c8d61ac7d464d580..2c55689898ae543f8f3286eea0c33ab089d3663c 100644
--- a/README.md
+++ b/README.md
@@ -27,5 +27,8 @@ LevelDB for rust
 4.  新建 Pull Request
 
 
-#### 特技
+## TODO
+[TODO和分工](doc/TODOList.md)
 
+## 编码和git规范
+[编码和git规范](doc/CodeStyle.md)
\ No newline at end of file
diff --git a/doc/CodeStyle.md b/doc/CodeStyle.md
new file mode 100644
index 0000000000000000000000000000000000000000..cc05186c66af927fb8d5fb8f85ed79eb9ae48119
--- /dev/null
+++ b/doc/CodeStyle.md
@@ -0,0 +1,15 @@
+# 1. 规范
+1. 实现和测试分成两个文件, 实现文件 xx.rs, 测试文件 xx_test.rs 
+2. struct/trait 驼峰式命名, 方法 全小写下滑线命名
+3. 其它的参照 Rust 编码规范
+4. 所有方法都要求测试案例覆盖
+5. 所有方法都要求有注释
+6. 常量都要求有注释
+7. 缩写要遵循业界规范
+8. cargo不允许引用第三方库
+
+# 2. 分支管理规范
+1. master作为主分支
+2. feat/xx 作为开发分支
+3. 其它人从主分支checkout分支
+4. 开发分支提交到git, 然后发起 merge_request, merge 必须超过2个人同意
\ No newline at end of file
diff --git a/doc/TODOList.md b/doc/TODOList.md
new file mode 100644
index 0000000000000000000000000000000000000000..d4e60bb6e0f307ff2b88f17dc139291a3d8ab823
--- /dev/null
+++ b/doc/TODOList.md
@@ -0,0 +1,38 @@
+# DB
+## Build / Compaction
+## DB implements
+## Log - WAL canghai
+## Memtable - wangxu
+## SkipList - wangxu
+## Snapshot / VersionSet - yuanyang, zhangtao, canghai
+## WriteBatch
+## TableCache
+
+# Table
+## Block
+## FilterBlock
+## Format (encode/decode)
+## Table Level Iterator (Empty / MergingIterator / TwoLevelIterator)
+## Table Build
+## Recovery
+## SStable - canghai
+
+# Util
+## Arena (Memory Management) - wangboo
+## BloomFilter - yuanyang
+## Cache - wangxu
+## Coding (Primitive Type SerDe) - wangxu
+## Comparator - yuanyang
+## CRC - canghai
+## Env - canghai
+## Hash - canghai
+## Histgram - zhengcheng
+## Logging - zhoujian
+## MutexLock - zhengcheng
+## Status - yuanyang
+## Random - yuanyang
+## Slice - wangboo
+
+# Traits
+## public trait defined in leveldb include dir
+# 
\ No newline at end of file
diff --git a/src/db/mod.rs b/src/db/mod.rs
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000000000000000000000000000000000000..376832202a824ba64d7545db9b32132d0b104721
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,13 @@
+mod db;
+mod table;
+mod util;
+mod traits;
+
+mod test {
+
+    #[test]
+    pub fn test() {
+        println!("hello world");
+    }
+
+}
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
deleted file mode 100644
index e7a11a969c037e00a796aafeff6258501ec15e9a..0000000000000000000000000000000000000000
--- a/src/main.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello, world!");
-}
diff --git a/src/table/mod.rs b/src/table/mod.rs
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/src/traits/iterator.rs b/src/traits/iterator.rs
new file mode 100644
index 0000000000000000000000000000000000000000..319650a7a237f22507e4ef62f6347fac70f37f12
--- /dev/null
+++ b/src/traits/iterator.rs
@@ -0,0 +1,24 @@
+use crate::util::Slice;
+
+pub trait Iterator {
+
+    fn valid(&self) -> bool;
+
+    fn seek_to_first(&mut self);
+
+    fn seek_to_last(&mut self);
+
+    fn seek(&mut self, target: &Slice);
+
+    fn next(&mut self);
+
+    fn pre(&mut self);
+
+    fn key(&self) -> &Slice;
+
+    fn value(&self) -> &Slice;
+}
+
+trait AAA {
+
+}
diff --git a/src/traits/mod.rs b/src/traits/mod.rs
new file mode 100644
index 0000000000000000000000000000000000000000..962c0ad7e80408f192fe458fc2096d7c1f36df13
--- /dev/null
+++ b/src/traits/mod.rs
@@ -0,0 +1,4 @@
+use crate::util::Slice;
+
+mod iterator;
+
diff --git a/src/util/mod.rs b/src/util/mod.rs
new file mode 100644
index 0000000000000000000000000000000000000000..3f159e66e099d362139eb5513fe2506f8eab5d8b
--- /dev/null
+++ b/src/util/mod.rs
@@ -0,0 +1,3 @@
+mod slice;
+mod status;
+mod slice_test;
\ No newline at end of file
diff --git a/src/util/slice.rs b/src/util/slice.rs
new file mode 100644
index 0000000000000000000000000000000000000000..da59ff75bef4fbc5153c226c93fc48d672f639ba
--- /dev/null
+++ b/src/util/slice.rs
@@ -0,0 +1,11 @@
+
+pub struct Slice {
+
+}
+
+impl Default for Slice {
+    fn default() -> Self {
+        todo!()
+    }
+}
+
diff --git a/src/util/slice_test.rs b/src/util/slice_test.rs
new file mode 100644
index 0000000000000000000000000000000000000000..02d05e289bd0ea11c838bd5810af8d336aceb0b2
--- /dev/null
+++ b/src/util/slice_test.rs
@@ -0,0 +1,10 @@
+
+mod test {
+    use crate::util::slice::Slice;
+
+    #[test]
+    fn test() {
+        let slice = Slice::default();
+    }
+
+}
\ No newline at end of file
diff --git a/src/util/status.rs b/src/util/status.rs
new file mode 100644
index 0000000000000000000000000000000000000000..ae9e509f916cf277e9a414a6ec40278a0e76f793
--- /dev/null
+++ b/src/util/status.rs
@@ -0,0 +1,4 @@
+
+pub enum Status {
+
+}
\ No newline at end of file