diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1fb57ae72..1bf0452d6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,7 +8,7 @@ jobs:
     name: build-centos7
     runs-on: ubuntu-20.04
     needs:
-      - multile-arch-amd64
+      - utest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -28,7 +28,7 @@ jobs:
     name: build-centos6
     runs-on: ubuntu-20.04
     needs:
-      - multile-arch-amd64
+      - utest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -42,7 +42,7 @@ jobs:
     name: build-ubuntu16
     runs-on: ubuntu-20.04
     needs:
-      - multile-arch-amd64
+      - utest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -56,7 +56,7 @@ jobs:
     name: build-ubuntu18
     runs-on: ubuntu-20.04
     needs:
-      - multile-arch-amd64
+      - utest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -70,7 +70,7 @@ jobs:
     name: build-ubuntu20
     runs-on: ubuntu-20.04
     needs:
-      - multile-arch-amd64
+      - utest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -84,7 +84,7 @@ jobs:
     name: build-cross-arm
     runs-on: ubuntu-20.04
     needs:
-      - multile-arch-amd64
+      - utest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -97,7 +97,7 @@ jobs:
     name: build-cross-aarch64
     runs-on: ubuntu-20.04
     needs:
-      - multile-arch-amd64
+      - utest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -123,8 +123,6 @@ jobs:
   utest:
     name: utest
     runs-on: ubuntu-20.04
-    needs:
-      - multile-arch-amd64
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -141,8 +139,6 @@ jobs:
   coverage:
     name: coverage
     runs-on: ubuntu-20.04
-    needs:
-      - utest
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
@@ -231,24 +227,15 @@ jobs:
             --build-arg IMAGE=ossrs/srs:ubuntu20-cache \
             -f trunk/Dockerfile .
 
-  artifacts:
-    name: artifacts-done
+  done:
+    name: done
     needs:
+      - build
+      - coverage
       - multile-arch-armv7
       - multile-arch-aarch64
       - multile-arch-amd64
     runs-on: ubuntu-20.04
-    steps:
-      - run: echo 'Artifacts done'
-
-  done:
-    name: done
-    needs:
-      - build
-      - utest
-      - coverage
-      - artifacts
-    runs-on: ubuntu-20.04
     steps:
       - run: echo 'All done'
 
diff --git a/README.md b/README.md
index b8ffc5438..32c39be80 100755
--- a/README.md
+++ b/README.md
@@ -202,6 +202,10 @@ Please read [APIS](trunk/doc/Resources.md#apis).
 
 Please read [MIRRORS](trunk/doc/Resources.md#mirrors).
 
+## Dockers
+
+Please read [DOCKERS](trunk/doc/Dockers.md).
+
 Beijing, 2013.10<br/>
 Winlin
 
diff --git a/trunk/doc/Dockers.md b/trunk/doc/Dockers.md
new file mode 100644
index 000000000..e9a34c08c
--- /dev/null
+++ b/trunk/doc/Dockers.md
@@ -0,0 +1,90 @@
+# Dockers
+
+About SRS Dockerfile:
+
+* Dockerfile: For release and test.
+* Dockerfile.pkg: For package binary.
+* Dockerfile.builds: For test.
+* Dockerfile.test: For test.
+* Dockerfile.cov: For test and coverage.
+
+## Dependency Tree
+
+The dependency tree about Dockerfile:
+
+* Dockerfile
+  * [ossrs/srs:ubuntu20](https://github.com/ossrs/dev-docker/tree/ubuntu20)
+    * [ossrs/srs:ubuntu20-base2](https://github.com/ossrs/dev-docker/blob/ubuntu20/Dockerfile.base2)
+      * [ossrs/srs:ubuntu20-base](https://github.com/ossrs/dev-docker/blob/ubuntu20/Dockerfile.base)
+        * ubuntu:focal
+    * ubuntu:focal
+  * [ossrs/srs:ubuntu20-cache](https://github.com/ossrs/dev-docker/tree/ubuntu20-cache)
+    * [ossrs/srs:ubuntu20](https://github.com/ossrs/dev-docker/tree/ubuntu20)
+      * ubuntu:focal
+  * ubuntu:focal
+* Dockerfile.test
+  * [ossrs/srs:dev-gcc7-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev-gcc7-cache)
+    * [ossrs/srs:dev-gcc7](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev-gcc7)
+      * centos:7
+* Dockerfile.cov
+  * [ossrs/srs:dev-gcc7-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev-gcc7-cache)
+      * [ossrs/srs:dev-gcc7](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev-gcc7)
+          * centos:7
+* Dockerfile.pkg
+  * [ossrs/srs:dev](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev)
+    * centos:7
+* Dockerfile.builds
+  * [ossrs/srs:dev-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev-cache)
+    * [ossrs/srs:dev](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev)
+      * centos:7
+  * [ossrs/srs:dev6-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev6-cache)
+    * [ossrs/srs:dev6](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev6)
+      * centos:6
+  * [ossrs/srs:ubuntu16-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu16-cache)
+      * [ossrs/srs:ubuntu16](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu16)
+          * ubuntu:xenial
+  * [ossrs/srs:ubuntu18-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu18-cache)
+      * [ossrs/srs:ubuntu18](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu18)
+          * ubuntu:bionic
+  * [ossrs/srs:ubuntu20-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu20-cache)
+      * [ossrs/srs:ubuntu20](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu20)
+          * ubuntu:focal
+  * [ossrs/srs:ubuntu16-cross-arm](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu16-cross-arm)
+      * [ossrs/srs:ubuntu16](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu16)
+          * ubuntu:xenial
+  * [ossrs/srs:ubuntu16-cross-aarch64](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu16-cross-aarch64)
+      * [ossrs/srs:ubuntu16](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu16)
+          * ubuntu:xenial
+  * [ossrs/srs:ubuntu20-cross-arm](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu20-cross-arm)
+      * [ossrs/srs:ubuntu20](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu20)
+          * ubuntu:focal
+  * [ossrs/srs:ubuntu20-cross-aarch64](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu20-cross-aarch64)
+      * [ossrs/srs:ubuntu20](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu20)
+          * ubuntu:focal
+
+## Image for Cache
+
+To speedup the test, we use a set of cache images. 
+
+If need to reconfigure SRS, please update SRS, then update the images:
+
+* [ossrs/srs:dev-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev-cache)
+* [ossrs/srs:dev6-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:dev6-cache)
+* [ossrs/srs:ubuntu16-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu16-cache)
+* [ossrs/srs:ubuntu18-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu18-cache)
+* [ossrs/srs:ubuntu20-cache](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu20-cache)
+* [ossrs/srs:ubuntu16-cross-arm](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu16-cross-arm)
+* [ossrs/srs:ubuntu16-cross-aarch64](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu16-cross-aarch64)
+* [ossrs/srs:ubuntu20-cross-arm](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu20-cross-arm)
+* [ossrs/srs:ubuntu20-cross-aarch64](https://github.com/ossrs/dev-docker/tree/ossrs/srs:ubuntu20-cross-aarch64)
+
+For example, update the [release.yml](https://github.com/ossrs/dev-docker/blob/ubuntu20-cache/.github/workflows/release.yml) for ubuntu20-cache:
+
+```bash
+# Build SRS for cache, never install it.
+#     SRS is 2d036c3fd Fix #2747: Support Apple Silicon M1(aarch64). v5.0.41
+# Please update this comment, if need to refresh the cached dependencies, like st/openssl/ffmpeg/libsrtp/libsrt etc.
+```
+
+Then push to github and the image will be updated automatically.
+