diff --git a/docs/en/concepts-and-designs/README.md b/docs/en/concepts-and-designs/README.md
index d1f40885c..b638bf7a4 100644
--- a/docs/en/concepts-and-designs/README.md
+++ b/docs/en/concepts-and-designs/README.md
@@ -36,7 +36,7 @@ TODO
 
 ### KubeSphere DevOps 
 
-TODO(@runzexia)
+Read [DevOps Pipeline Overview](devops-pipeline-overview.md).
 
 ### KubeSphere S2I/B2I 
 
diff --git a/docs/en/concepts-and-designs/devops-pipeline-overview.md b/docs/en/concepts-and-designs/devops-pipeline-overview.md
new file mode 100644
index 000000000..ab332df8f
--- /dev/null
+++ b/docs/en/concepts-and-designs/devops-pipeline-overview.md
@@ -0,0 +1,73 @@
+# KubeSphere DevOps Pipeline Overview
+
+KubeSphere DevOps Pipeline is aimed to meet the complex CI/CD requirements on Kubernetes.
+
+With the KubeSphere DevOps Pipeline, you can quickly construct a complete CI/CD workflow and architecture by manipulating with the KubeSphere console.
+
+
+## DevOps Pipeline Capabilities
+
+* Build, Deploy, Launch services in Kubernetes 
+* Use Kubernetes dynamic agent to release the ability of Kubernetes to dynamically expand
+* In SCM Pipeline and Out of SCM Pipeline 
+* Easy-to-use graphical pipeline editing panel 
+* Multi-tenant isolation
+
+
+### DevOps Pipeline API
+
+The KubeSphere DevOps Pipeline API will encapsulate the following APIs to provide a standardized REST API:
+
+- Jenkins Core API
+- Jenkins BlueOcean API
+- Sonarqube API
+- Other Plugins API
+
+KubeSphere apiserver will provide multi-tenant API, pipeline API, credential API, code quality analysis API, etc.
+
+![ks-devops-api](../../images/devops-api.png)
+
+
+### Multi-tenant isolation
+
+In the current version (v2.1.0), multi-tenancy in the DevOps part is done with the ability of the [role-strategy-plugin](https://github.com/jenkinsci/role-strategy-plugin) plugin. KubeSphere will automatically synchronize permission rules in this plugin.
+
+In the future, KubeSphere DevOps will authentication based on [OPA](https://www.openpolicyagent.org/).
+
+### Integration with Jenkins
+
+KubeSphere integrates with standard Jenkins, customizing plugins and configurations.
+
+#### Distribution of plugins
+
+To meet the needs of users in private cloud environments, KubeSphere uses the built-in nginx as a jenkins update center. The jenkins update center is provided as a Docker image + [Helm Chart](https://github.com/kubesphere/ks-installer/tree/master/roles/ks-devops/jenkins-update-center).
+
+#### Jenkins configuration
+
+KubeSphere uses Docker Image, Jenkins update Center and Helm Chart to distribute Jenkins。
+
+The list of plugins and configuration required by Jenkins will be provided by [Helm Chart](https://github.com/kubesphere/ks-installer/tree/master/roles/ks-devops/jenkins).
+
+We use [Groovy Script](https://wiki.jenkins.io/display/JENKINS/Groovy+Hook+Script) and [JCasC](https://github.com/jenkinsci/configuration-as-code-plugin) to initialize Jenkins.
+
+
+### Pipeline Builder Image And Jenkins PodTemplate
+
+Jenkins does not include any agent configuration by default, KubeSphere provides some default agents (including docker image and podTemplate configuration).
+
+The default agent image will be built based on the [builder base](https://github.com/kubesphere/builder-base), you can search the keyword of repository `builder xxx`  in KubeSphere [github](https://github.com/kubesphere/).
+
+### In SCM Pipeline and Out of SCM Pipeline 
+
+KubeSphere's pipeline syntax will be fully compatible with Jenkins' pipeline syntax. Jenkinsfile found in SCM will be supported with Jenkins plugin.
+
+We will provide a plug-in SCM API, allowing users to graphically edit Jenkinsfile, Dockerfile and other configurations in SCM on KubeSphere.
+
+### Sonarqube Integration
+
+KubeSphere will retrieve Jenkins pipelines that have performed Sonarqube code analysis. And provide API to access analysis report.
+
+
+### More
+
+If you have more questions, you can create an issue on [github](https://github.com/kubesphere/kubesphere)
diff --git a/docs/en/guides/Kubesphere-code-layout.md b/docs/en/guides/Kubesphere-code-layout.md
new file mode 100644
index 000000000..46b075d2a
--- /dev/null
+++ b/docs/en/guides/Kubesphere-code-layout.md
@@ -0,0 +1,167 @@
+# KubeSphere File Tree
+
+This document describes the directory structure of the KubeSphere repository.
+
+
+```
+├── api // Automatically generated API documentation
+│   ├── api-rules
+│   ├── ks-openapi-spec // REST API documentation provided by kubesphere apiserver
+│   └── openapi-spec // REST API documentation provided by kubesphere apiserver
+├── build // Dockerfile 
+│   ├── hypersphere 
+│   ├── ks-apigateway
+│   ├── ks-apiserver
+│   ├── ks-controller-manager
+│   ├── ks-iam
+│   └── ks-network
+├── cmd // Main applications for KubeSphere.
+│   ├── controller-manager  // Kubesphere Controller Manger, used to reconcile KubeSphere CCRD
+│   │   └── app
+│   ├── hypersphere 
+│   ├── ks-apigateway // KubeSphere API gateway
+│   │   └── app
+│   ├── ks-apiserver // KubeSphere REST API server
+│   │   └── app
+│   ├── ks-iam // KubeSphere iam service
+│   │   └── app
+│   └── ks-network
+├── config // CRD config files
+│   ├── crds // CRD yaml files
+│   ├── default // kustomization yaml files
+│   ├── manager // controller manager yaml files
+│   ├── rbac // rbac yaml files
+│   ├── samples // CRD sample
+│   └── webhook // webhppk yaml files
+├── docs 
+│   ├── en
+│   │   ├── concepts-and-designs
+│   │   └── guides
+│   └── images
+├── hack // Script files to help people develop
+│   └── lib
+├── pkg // Library code. 
+│   ├── api // Structure definitions for REST APIs
+│   │   ├── devops
+│   │   ├── logging
+│   │   └── monitoring
+│   ├── apigateway 
+│   │   └── caddy-plugin
+│   ├── apis // Structure definitions for CRDs
+│   │   ├── devops
+│   │   ├── network
+│   │   ├── servicemesh
+│   │   └── tenant
+│   ├── apiserver // REST API parameter processing
+│   │   ├── components
+│   │   ├── devops
+│   │   ├── git
+│   │   ├── iam
+│   │   ├── logging
+│   │   ├── monitoring
+│   │   ├── openpitrix
+│   │   ├── operations
+│   │   ├── quotas
+│   │   ├── registries
+│   │   ├── resources
+│   │   ├── revisions
+│   │   ├── routers
+│   │   ├── runtime
+│   │   ├── servicemesh
+│   │   ├── tenant
+│   │   ├── terminal
+│   │   ├── workloadstatuses
+│   │   └── workspaces
+│   ├── client //Automatically generated CRD client
+│   │   ├── clientset
+│   │   ├── informers
+│   │   └── listers
+│   ├── constants // common constants
+│   ├── controller // controller manger's reconciliation logic
+│   │   ├── application
+│   │   ├── clusterrolebinding
+│   │   ├── destinationrule
+│   │   ├── job
+│   │   ├── namespace
+│   │   ├── network
+│   │   ├── s2ibinary
+│   │   ├── s2irun
+│   │   ├── storage
+│   │   ├── virtualservice
+│   │   └── workspace
+│   ├── db // Database ORM Framework
+│   │   ├── ddl
+│   │   ├── schema
+│   │   └── scripts
+│   ├── gojenkins // Jenkins Go Client
+│   │   ├── _tests
+│   │   └── utils
+│   ├── informers
+│   ├── kapis // REST API registration
+│   │   ├── devops
+│   │   ├── iam
+│   │   ├── logging
+│   │   ├── monitoring
+│   │   ├── openpitrix
+│   │   ├── operations
+│   │   ├── resources
+│   │   ├── servicemesh
+│   │   ├── tenant
+│   │   └── terminal
+│   ├── models // Data processing part of REST API
+│   │   ├── components
+│   │   ├── devops
+│   │   ├── git
+│   │   ├── iam
+│   │   ├── kubeconfig
+│   │   ├── kubectl
+│   │   ├── log
+│   │   ├── metrics
+│   │   ├── nodes
+│   │   ├── openpitrix
+│   │   ├── quotas
+│   │   ├── registries
+│   │   ├── resources
+│   │   ├── revisions
+│   │   ├── routers
+│   │   ├── servicemesh
+│   │   ├── status
+│   │   ├── storage
+│   │   ├── tenant
+│   │   ├── terminal
+│   │   ├── workloads
+│   │   └── workspaces
+│   ├── server // Data processing part of REST API
+│   │   ├── config
+│   │   ├── errors
+│   │   ├── filter
+│   │   ├── options
+│   │   └── params
+│   ├── simple // common clients
+│   │   └── client
+│   ├── test
+│   ├── utils // common utils
+│   │   ├── hashutil
+│   │   ├── idutils
+│   │   ├── iputil
+│   │   ├── jsonutil
+│   │   ├── jwtutil
+│   │   ├── k8sutil
+│   │   ├── net
+│   │   ├── readerutils
+│   │   ├── reflectutils
+│   │   ├── signals
+│   │   ├── sliceutil
+│   │   ├── stringutils
+│   │   └── term
+│   ├── version
+│   └── webhook
+├── test // e2e test code
+│   ├── e2e
+├── tools // tools to genereate API docs
+│   ├── cmd
+│   │   ├── crd-doc-gen // gen CRD API docs
+│   │   └── doc-gen // gen REST API docs
+│   └── lib
+
+```
diff --git a/docs/en/guides/README.md b/docs/en/guides/README.md
index 356835a87..ab4a5e832 100644
--- a/docs/en/guides/README.md
+++ b/docs/en/guides/README.md
@@ -28,11 +28,14 @@ Compiling Guide teaches developer how to build the project in local and set up t
 2. Understand the workflow of kubesphere development.  
 Read [Development Workflow](Development-workflow.md).
 
-3. Understand the best practices for submitting PR and our code of conduct  
+3. Learn KubeSphere code layout
+
+Read [KubeSphere Code Layout](Kubesphere-code-layout.md).
+
+4. Understand the best practices for submitting PR and our code of conduct  
 Read [best practices for submitting PR](pull-requests.md).  
 Read [code of conduct](code-of-conduct.md).
 
-### KubeSphere Core developer
 
 ### KubeSphere Installer developer
 
@@ -56,7 +59,9 @@ TODO(@magicsong)
 
 ### KubeSphere DevOps developer
 
-TODO(@runzexia)
+Users who are interested in DevOps Pipeline, you can read the documentation according to the [guidelines above](README.md#for-code-developer).
+
+The function of KubeSphere DevOps is mainly provided by KubeSphere apiserver.
 
 ### KubeSphere S2I/B2I developer
 
diff --git a/docs/images/devops-api.png b/docs/images/devops-api.png
new file mode 100644
index 000000000..e8e36f708
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