diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 000332a..8caee93 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -21,6 +21,8 @@ jobs:
         run: |
           cd code
           cargo fmt --all -- --check
+          cd ch02-03
+          cargo fmt --all -- --check
 #        uses: actions-rs/cargo@v1
 #        with:
 #          command: fmt
@@ -29,6 +31,8 @@ jobs:
         run: |
           cd code
           cargo clippy
+          cd ch02-03
+          cargo clippy
 #        uses: actions-rs/cargo@v1
 #        with:
 #          command: clippy
@@ -36,7 +40,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, macos-latest]
+        os: [ubuntu-20.04]      
+#        os: [ubuntu-20.04, macos-latest]
     steps:
       - uses: actions/checkout@v2
         with:
@@ -50,15 +55,17 @@ jobs:
         run: |
           cd code
           cargo build
+          cd ch02-03
+          cargo build
 #        uses: actions-rs/cargo@v1
 #        with:
 #          command: build  
-
   test:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04, macos-latest]
+        os: [ubuntu-20.04]      
+#        os: [ubuntu-20.04, macos-latest]
     steps:
       - uses: actions/checkout@v2
         with:
@@ -72,3 +79,27 @@ jobs:
         run: |
           cd code
           cargo test
+          cd ch02-03
+          cargo test
+
+  doc:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04]      
+#        os: [ubuntu-20.04, macos-latest]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly-2021-07-27
+          components: rust-src
+      - name: Build docs
+        run: |
+          cd code
+          cargo doc --no-deps --all-features
+          cd ch02-03
+          cargo doc --no-deps --all-features
diff --git a/README.md b/README.md
index 8fdc113..4a15be7 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,16 @@
 # zCore Tutorial
 
+[![CI](https://github.com/rcore-os/zCore-Tutorial/workflows/CI/badge.svg?branch=master)](https://github.com/rcore-os/zCore-Tutorial/actions)
+[![Docs](https://img.shields.io/badge/docs-alpha-blue)](https://rcore-os.github.io/zCore-Tutorial/)
+
+zCore Toturial 的目标是通过`step by step`地建立一个简化的zCore kernel的过程来学习和掌握zCore Kernel的核心概念和对应实现，从而为进一步分析掌握zCore的完整内核打下基础。
+
+zCore Toturial 的特点是所有的code都在用户态运行，便于调试和分析。
+
 ## 仓库目录
 
 * `docs/`: 教学实验指导
-* `zcore`: 操作系统代码
+* `code`: 操作系统代码
 
 ## 实验指导
 
@@ -23,3 +30,20 @@ mdbook serve docs
 ```
 rustc 1.56.0-nightly (08095fc1f 2021-07-26)
 ```
+
+## 参考
+- https://fuchsia.dev/
+  - https://fuchsia.dev/fuchsia-src/concepts/kernel
+  - https://fuchsia.dev/fuchsia-src/reference/kernel_objects/objects
+  - https://fuchsia.dev/fuchsia-src/reference/syscalls
+  - https://github.com/zhangpf/fuchsia-docs-zh-CN/tree/master/zircon
+  - [许中兴博士演讲：Fuchsia OS 简介](https://xuzhongxing.github.io/201806fuchsia.pdf)
+    
+- 毕设论文
+  - [Rust语言操作系统的设计与实现,王润基本科毕设论文,2019](https://github.com/rcore-os/zCore/wiki/files/wrj-thesis.pdf) 
+  - [zCore操作系统内核的设计与实现,潘庆霖本科毕设论文,2020](https://github.com/rcore-os/zCore/wiki/files/pql-thesis.pdf)
+  
+- 开发文档
+  - https://github.com/rcore-os/zCore/wiki/documents-of-zcore
+
+- 更简单和基础的[rCore-Tutorial v3](https://rcore-os.github.io/rCore-Tutorial-Book-v3/)：如果看不懂上面的内容，可以先看看这个教程。
diff --git a/code/Cargo.toml b/code/Cargo.toml
index 20ef163..3818402 100644
--- a/code/Cargo.toml
+++ b/code/Cargo.toml
@@ -4,4 +4,6 @@ members = [
     "ch01-02",
     "ch01-03",
     "ch02-02",
+#   "ch02-03",
+#   "ch03-02",
 ]
diff --git a/code/ch01-01/src/object/mod.rs b/code/ch01-01/src/object/mod.rs
index 1c114c2..e6361f4 100644
--- a/code/ch01-01/src/object/mod.rs
+++ b/code/ch01-01/src/object/mod.rs
@@ -127,6 +127,7 @@ impl_kobject!(DummyObject);
 
 impl DummyObject {
     /// 创建一个新 `DummyObject`
+    #[allow(dead_code)]
     pub fn new() -> Arc<Self> {
         Arc::new(DummyObject {
             base: KObjectBase::default(),
diff --git a/code/ch01-02/src/object/handle.rs b/code/ch01-02/src/object/handle.rs
index 592282d..455a462 100644
--- a/code/ch01-02/src/object/handle.rs
+++ b/code/ch01-02/src/object/handle.rs
@@ -1,5 +1,5 @@
 // ANCHOR: handle
-use super::{DummyObject, KernelObject, Rights};
+use super::{KernelObject, Rights};
 use alloc::sync::Arc;
 
 /// 内核对象句柄
@@ -20,7 +20,7 @@ impl Handle {
 #[cfg(test)]
 mod tests {
     use super::*;
-
+    use crate::object::DummyObject;
     #[test]
     fn new_obj_handle() {
         let obj = DummyObject::new();
diff --git a/code/ch01-03/src/ipc/channel.rs b/code/ch01-03/src/ipc/channel.rs
index 1b6d0e5..f93146d 100644
--- a/code/ch01-03/src/ipc/channel.rs
+++ b/code/ch01-03/src/ipc/channel.rs
@@ -60,7 +60,7 @@ impl Channel {
     /// Read a packet from the channel if check is ok, otherwise the msg will keep.
     pub fn read(&self) -> ZxResult<T> {
         let mut recv_queue = self.recv_queue.lock();
-        if let Some(msg) = recv_queue.front() {
+        if let Some(_msg) = recv_queue.front() {
             let msg = recv_queue.pop_front().unwrap();
             return Ok(msg);
         }
diff --git a/code/ch01-03/src/object/handle.rs b/code/ch01-03/src/object/handle.rs
index 592282d..455a462 100644
--- a/code/ch01-03/src/object/handle.rs
+++ b/code/ch01-03/src/object/handle.rs
@@ -1,5 +1,5 @@
 // ANCHOR: handle
-use super::{DummyObject, KernelObject, Rights};
+use super::{KernelObject, Rights};
 use alloc::sync::Arc;
 
 /// 内核对象句柄
@@ -20,7 +20,7 @@ impl Handle {
 #[cfg(test)]
 mod tests {
     use super::*;
-
+    use crate::object::DummyObject;
     #[test]
     fn new_obj_handle() {
         let obj = DummyObject::new();
diff --git a/code/ch02-02/src/ipc/channel.rs b/code/ch02-02/src/ipc/channel.rs
index f8f7d59..5639a8d 100644
--- a/code/ch02-02/src/ipc/channel.rs
+++ b/code/ch02-02/src/ipc/channel.rs
@@ -55,7 +55,7 @@ impl Channel {
     /// Read a packet from the channel if check is ok, otherwise the msg will keep.
     pub fn read(&self) -> ZxResult<T> {
         let mut recv_queue = self.recv_queue.lock();
-        if let Some(_) = recv_queue.front() {
+        if recv_queue.front().is_some() {
             let msg = recv_queue.pop_front().unwrap();
             return Ok(msg);
         }
diff --git a/code/ch02-02/src/task/process.rs b/code/ch02-02/src/task/process.rs
index cf63855..7dbc9a6 100644
--- a/code/ch02-02/src/task/process.rs
+++ b/code/ch02-02/src/task/process.rs
@@ -145,7 +145,7 @@ impl Process {
         Ok(object)
     }
 
-    pub fn start(&self) -> () {
+    pub fn start(&self) {
         // unimplemented!()
     }
 
@@ -164,7 +164,7 @@ impl Process {
     /// The process finally terminates.
     fn terminate(&self) {
         let mut inner = self.inner.lock();
-        let retcode = match inner.status {
+        let _retcode = match inner.status {
             Status::Exited(retcode) => retcode,
             _ => {
                 inner.status = Status::Exited(0);
diff --git a/code/ch02-03/object/src/task/thread.rs b/code/ch02-03/object/src/task/thread.rs
index 6917f10..e57fb6d 100644
--- a/code/ch02-03/object/src/task/thread.rs
+++ b/code/ch02-03/object/src/task/thread.rs
@@ -10,8 +10,8 @@ use {
         pin::Pin,
         task::{Context, Poll, Waker},
     },
-    trapframe::{UserContext},
     spin::Mutex,
+    trapframe::UserContext,
 };
 
 pub use self::thread_state::*;
@@ -258,7 +258,6 @@ impl Task for Thread {
     }
 }
 
-
 /// A handle to current thread.
 ///
 /// This is a wrapper of [`Thread`] that provides additional methods for the thread runner.
@@ -397,9 +396,9 @@ pub struct ThreadInfo {
 mod tests {
     use super::job::Job;
     use super::*;
+    use core::time::Duration;
     use kernel_hal::timer_now;
     use kernel_hal::GeneralRegs;
-    use core::time::Duration;
 
     #[test]
     fn create() {
@@ -469,7 +468,6 @@ mod tests {
         assert_eq!(thread.state(), ThreadState::Dead);
     }
 
-
     #[test]
     fn info() {
         let root_job = Job::root();
diff --git a/code/ch03-02/object/src/lib.rs b/code/ch03-02/object/src/lib.rs
index 0153a78..c434f09 100644
--- a/code/ch03-02/object/src/lib.rs
+++ b/code/ch03-02/object/src/lib.rs
@@ -17,7 +17,7 @@ mod error;
 mod ipc;
 mod object;
 mod task;
-mod vm;
 mod util;
+mod vm;
 
 pub use self::error::*;
diff --git a/code/ch03-02/object/src/task/thread.rs b/code/ch03-02/object/src/task/thread.rs
index 6917f10..e57fb6d 100644
--- a/code/ch03-02/object/src/task/thread.rs
+++ b/code/ch03-02/object/src/task/thread.rs
@@ -10,8 +10,8 @@ use {
         pin::Pin,
         task::{Context, Poll, Waker},
     },
-    trapframe::{UserContext},
     spin::Mutex,
+    trapframe::UserContext,
 };
 
 pub use self::thread_state::*;
@@ -258,7 +258,6 @@ impl Task for Thread {
     }
 }
 
-
 /// A handle to current thread.
 ///
 /// This is a wrapper of [`Thread`] that provides additional methods for the thread runner.
@@ -397,9 +396,9 @@ pub struct ThreadInfo {
 mod tests {
     use super::job::Job;
     use super::*;
+    use core::time::Duration;
     use kernel_hal::timer_now;
     use kernel_hal::GeneralRegs;
-    use core::time::Duration;
 
     #[test]
     fn create() {
@@ -469,7 +468,6 @@ mod tests {
         assert_eq!(thread.state(), ThreadState::Dead);
     }
 
-
     #[test]
     fn info() {
         let root_job = Job::root();