diff --git a/dagrs/README.md b/dagrs/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..2d1c7ec34a211ff382b07dd053d5f81b2d37294f
--- /dev/null
+++ b/dagrs/README.md
@@ -0,0 +1,50 @@
+# dagrs
+
+本项目是用 Rust 写的 DAG 执行引擎，开发文档请参考：[使用 Rust 编写 DAG 执行引擎](https://openeuler.feishu.cn/docs/doccnVLprAY6vIMv6W1vgfLnfrf)。
+
+
+
+## 用法
+
+确保 Rust 编译环境可用（`cargo build`），然后在此文件夹中运行`cargo build --release`，在`target/release/`中获取可执行文件，并将其放入PATH。
+
+命令行使用方式为：
+
+```bash
+$ dagrs <filename>
+```
+
+例如:
+
+```bash
+$ dagrs test/test2.yaml
+[Start] -> a -> b -> f -> d -> c -> g -> e -> h -> [End]
+```
+
+
+
+## YAML 定义
+
+YAML 定义 DAG 通过如下一个例子来说明：
+
+```YAML
+dagrs:
+    a:
+        name: "任务1"
+        rely: [b, c]
+    b:
+        name: "任务2"
+        rely: [c]
+    c:
+        name: "任务3"
+        # empty if no rely
+```
+
+- 这里有三个任务：a，b 和 c。这里的 a，b，c 并不是 `name` ，而是标识任务的标识，可以认为是 ID。
+- 例如 a 指向 b 和 c，表示 a 在 b，c 之前执行，写做 `rely: [b, c]` 。
+
+最终形成的图如下，那么一个可行的执行顺序是： `A->B->C->D->E`
+
+<img src="https://tva1.sinaimg.cn/large/008i3skNgy1gz3qe2or2qj30mg0ky0td.jpg" alt="img" style="zoom:33%;" />
+
+具体的任务定义可以后续随需要进行扩展。
\ No newline at end of file
diff --git a/dagrs/doc/doc.md b/dagrs/doc/doc.md
deleted file mode 100644
index d417a49626f027679ea0d7e105ba23ae0f5c14d5..0000000000000000000000000000000000000000
--- a/dagrs/doc/doc.md
+++ /dev/null
@@ -1,24 +0,0 @@
-[TOC]
-
-# Overview
-
-DAG Engine 有四个主要文件：
-
-- dag_engine.rs - Engine 的实现，具体功能包括从 YAML 读取、形成图、判断环和输出。
-- task.rs - 任务结构的实现。
-- graph.rs - 图的实现，用来记录任务之间的依赖关系。
-- error_handler.rs - 错误处理，只有最简单的错误输出。
-
-
-
-四个文件的关系如下：
-
-```
-                    dag_engine
-          /             |               \
-       /                |                  \
-   task.rs           graph.rs        error_handler
-      |                 |
-error_handler      error_handler
-```
-
diff --git a/dagrs/src/main.rs b/dagrs/src/main.rs
index e95e9100239d1670967d8ea87231953083c2e041..fbe888f057f4b60b1649609b28c771e7a99dbf3d 100644
--- a/dagrs/src/main.rs
+++ b/dagrs/src/main.rs
@@ -2,24 +2,51 @@
  * @Author: Yinwhe
  * @Date: 2022-01-19 14:14:28
  * @LastEditors: Yinwhe
- * @LastEditTime: 2022-01-26 23:39:46
+ * @LastEditTime: 2022-02-06 13:48:41
  * @Description: dagrs
- * @Copyright: Copyright (c) 2022
  */
 
 extern crate bimap;
 extern crate yaml_rust;
 
+mod dag_engine;
 mod error_handler;
 mod graph;
 mod task;
-mod dag_engine;
 
 use dag_engine::DagEngine;
 
 fn main() {
     let mut dagrs = DagEngine::new();
-    if let Err(e) = dagrs.run("test/test1.yaml") {
-        println!("[Error] {}", e);
+    if let Some(filename) = std::env::args().nth(1) {
+        if let Err(e) = dagrs.run(&filename) {
+            println!("[Error] {}", e);
+        }
+    } else {
+        println!("Usage: dargs <filename>")
     }
+}
+
+#[test]
+fn test1() {
+    let res = DagEngine::new().run("test/test1.yaml").unwrap();
+    assert_eq!(res, false);
+}
+
+#[test]
+fn test2() {
+    let res = DagEngine::new().run("test/test2.yaml").unwrap();
+    assert_eq!(res, true)
+}
+
+#[test]
+fn test3() {
+    let res = DagEngine::new().run("test/test3.yaml").unwrap();
+    assert_eq!(res, false)
+}
+
+#[test]
+fn test4() {
+    let res = DagEngine::new().run("test/test4.yaml").unwrap();
+    assert_eq!(res, false)
 }
\ No newline at end of file
diff --git a/dagrs/src/task.rs b/dagrs/src/task.rs
index 958c9f4d47088f87453476ad6e844f167d1193c6..b5900dfef831d11b38d556b8573606ba73b33215 100644
--- a/dagrs/src/task.rs
+++ b/dagrs/src/task.rs
@@ -2,9 +2,8 @@
  * @Author: Yinwhe
  * @Date: 2022-01-25 17:49:19
  * @LastEditors: Yinwhe
- * @LastEditTime: 2022-01-26 23:18:04
+ * @LastEditTime: 2022-02-06 13:40:58
  * @Description: Task implementation
- * @Copyright: Copyright (c) 2022
  */
 
 use crate::error_handler::DagError;
@@ -17,12 +16,15 @@ pub struct Task {
 }
 
 impl Task {
+    /// Parse Task from Yaml
     pub fn from_yaml(info: &Yaml) -> Result<Task, DagError> {
+        // Get name first
         let name = info["name"]
             .as_str()
             .ok_or(DagError::error("Task name not found"))?
             .to_owned();
 
+        // relys can be empty
         let mut relys = Vec::new();
         if let Some(rely_tasks) = info["rely"].as_vec() {
             for rely_task_id in rely_tasks {
diff --git a/dagrs/test/test2.yaml b/dagrs/test/test2.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..62ebc582962794d8dd04ef297088c68779862b28
--- /dev/null
+++ b/dagrs/test/test2.yaml
@@ -0,0 +1,24 @@
+dagrs:
+  a:
+    name: "任务1"
+    rely: [b, c]
+  b:
+    name: "任务2"
+    rely: [c, f, g]
+  c:
+    name: "任务3"
+    rely: [e, g]
+  d:
+    name: "任务4"
+    rely: [c, e]
+  e:
+    name: "任务5"
+    rely: [h]
+  f:
+    name: "任务6"
+    rely: [g]
+  g:
+    name: "任务7"
+    rely: [h]
+  h:
+    name: "任务8"
\ No newline at end of file
diff --git a/dagrs/test/test3.yaml b/dagrs/test/test3.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..80ad3e747899746db54ff78d8e53f52cd352dc85
--- /dev/null
+++ b/dagrs/test/test3.yaml
@@ -0,0 +1,25 @@
+dagrs:
+  a:
+    name: "任务1"
+    rely: [b, c]
+  b:
+    name: "任务2"
+    rely: [c, f, g]
+  c:
+    name: "任务3"
+    rely: [e, g]
+  d:
+    name: "任务4"
+    rely: [c, e]
+  e:
+    name: "任务5"
+    rely: [h]
+  f:
+    name: "任务6"
+    rely: [g]
+  g:
+    name: "任务7"
+    rely: [h]
+  h:
+    name: "任务8"
+    rely: [f]
\ No newline at end of file
diff --git a/dagrs/test/test4.yaml b/dagrs/test/test4.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..b0852cfe828bbea4f598b32dc8d6e61bf536afa0
--- /dev/null
+++ b/dagrs/test/test4.yaml
@@ -0,0 +1,4 @@
+dagrs:
+  a:
+    name: "任务1"
+    rely: [a]
\ No newline at end of file