diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index dbb72028..66fcf63c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,10 +1,24 @@
-## Contributing Guide
+# Contributing Guide
 
 Contributions are welcome, if you find some bugs or have some ideas, please open an issue or submit a pull request.
 
 Please ensure that you are using clean code, following the coding style and code organization in existing code, and make sure all the tests pass.
 
-Please submit one PR that does one thing, this is important, and helps us to review your code more easily and push to merge fast.
+Please submit **one PR that does one thing**, this is important, and helps us to review your code more easily and push to merge fast.
+
+## AI Assistance
+
+> 🤖 When you submit PR, please point out which parts are generated by AI, if any.
+
+All code generated by AI must be reviewed and tested by humans, and should follow the same coding style and code organization as existing code.
+
+The AI generated code without refactoring will be rejected.
+
+## Code Style
+
+Before you start to write code, please read the existing code to follow the same coding style and code organization.
+
+- Inspired by existing code or refer to macOS/Windows controls API design to name your functions, properties, structs etc.
 
 ## Development and Testing
 
@@ -25,3 +39,18 @@ There is also available some split examples, run `cargo run --example` to see th
 ```bash
 cargo run --example table
 ```
+
+## UI Guides
+
+GPUI Component is inspired by macOS and Windows controls, combined with shadcn/ui design for a modern experience.
+
+So please refer to the following UI guides when you design or change the UI components:
+
+- [Apple Human Interface Guidelines](https://developer.apple.com/design/human-interface-guidelines/)
+- [Microsoft Fluent Design System](https://learn.microsoft.com/en-us/windows/apps/design/)
+- [shadcn/ui](https://ui.shadcn.com/)
+
+### Rules
+
+- Use `default` mouse cursor not `pointer` for buttons, unless it's a link button, we are building desktop apps, not web apps.
+- Use `md` size for most cases and as the default.