diff --git a/docs/developers/references/devex/faq.md b/docs/developers/references/devex/faq.md
index 3eef7345..2427eb01 100644
--- a/docs/developers/references/devex/faq.md
+++ b/docs/developers/references/devex/faq.md
@@ -2,6 +2,12 @@
 title:  FAQ
 ---
 
+## Common Questions
+
+### Who are using KubeVela?
+
+https://github.com/kubevela/kubevela/issues/1662
+
 ### What is the difference between KubeVela and project-X ?
 
 Refer to the [comparison details](https://kubevela.io/docs/#kubevela-vs-other-software).
@@ -34,4 +40,33 @@ By default, the community use images from docker registry for installation. You
 2. Alibaba Container Registry also sponsor KubeVela community, you can use `acr.kubevela.net/` as prefix for the docker registry, acr has a sync for each KubeVela official images. Use it like `acr.kubevela.net/oamdev/vela-core:latest`.
 
 3. If you insist on using Docker registry, you may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit .
- 
\ No newline at end of file
+ 
+### SchemaError of ApplicationRevision CRD
+
+> SchemaError(dev.oam.core.v1beta1.ApplicationRevision.spec.referredObjects): array should have exactly one sub-item） 
+
+https://github.com/kubevela/kubevela/issues/3874
+
+This could be a potential problem for k8s 1.19. Try to run the following command and see if it can help.
+
+```
+kubectl patch crd applicationrevisions.core.oam.dev --type json -p='[{"op": "remove", "path": "/spec/versions/1/schema/openAPIV3Schema/properties/spec/properties/referredObjects/x-kubernetes-preserve-unknown-fields"}]'
+```
+
+### How to get my admin password of VelaUX?
+
+If you're using v1.3, the default password is in the secret:
+
+```
+kubectl get secret admin -n vela-system
+```
+
+If you're using v1.4+, the default password is `VelaUX12345`.
+
+### How can I build my own addon registry?
+
+https://kubevela.io/docs/platform-engineers/addon/addon-registry
+
+### How does KubeVela support stateful workload?
+
+We recommend you to use [CRD Operator](https://kubernetes.io/docs/concepts/extend-kubernetes/operator/) for stateful workload. If you just want to use StatefulSet, you can refer to [this blog](https://kubevela.io/blog/2022/05/30/abstraction-kubevela) to build your own easily.
\ No newline at end of file
diff --git a/versioned_docs/version-v1.4/developers/references/devex/faq.md b/versioned_docs/version-v1.4/developers/references/devex/faq.md
index 3eef7345..2427eb01 100644
--- a/versioned_docs/version-v1.4/developers/references/devex/faq.md
+++ b/versioned_docs/version-v1.4/developers/references/devex/faq.md
@@ -2,6 +2,12 @@
 title:  FAQ
 ---
 
+## Common Questions
+
+### Who are using KubeVela?
+
+https://github.com/kubevela/kubevela/issues/1662
+
 ### What is the difference between KubeVela and project-X ?
 
 Refer to the [comparison details](https://kubevela.io/docs/#kubevela-vs-other-software).
@@ -34,4 +40,33 @@ By default, the community use images from docker registry for installation. You
 2. Alibaba Container Registry also sponsor KubeVela community, you can use `acr.kubevela.net/` as prefix for the docker registry, acr has a sync for each KubeVela official images. Use it like `acr.kubevela.net/oamdev/vela-core:latest`.
 
 3. If you insist on using Docker registry, you may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit .
- 
\ No newline at end of file
+ 
+### SchemaError of ApplicationRevision CRD
+
+> SchemaError(dev.oam.core.v1beta1.ApplicationRevision.spec.referredObjects): array should have exactly one sub-item） 
+
+https://github.com/kubevela/kubevela/issues/3874
+
+This could be a potential problem for k8s 1.19. Try to run the following command and see if it can help.
+
+```
+kubectl patch crd applicationrevisions.core.oam.dev --type json -p='[{"op": "remove", "path": "/spec/versions/1/schema/openAPIV3Schema/properties/spec/properties/referredObjects/x-kubernetes-preserve-unknown-fields"}]'
+```
+
+### How to get my admin password of VelaUX?
+
+If you're using v1.3, the default password is in the secret:
+
+```
+kubectl get secret admin -n vela-system
+```
+
+If you're using v1.4+, the default password is `VelaUX12345`.
+
+### How can I build my own addon registry?
+
+https://kubevela.io/docs/platform-engineers/addon/addon-registry
+
+### How does KubeVela support stateful workload?
+
+We recommend you to use [CRD Operator](https://kubernetes.io/docs/concepts/extend-kubernetes/operator/) for stateful workload. If you just want to use StatefulSet, you can refer to [this blog](https://kubevela.io/blog/2022/05/30/abstraction-kubevela) to build your own easily.
\ No newline at end of file