This document describes how the UI effect applied to the BlackBerry device, the contents of the documentation include the following sections: MIDP-based UI 2. Application of UI Library based on 3rd-Party 3. Application based on BlackBerry UI components 4. UI design based on SVG (JSR 226) 5. UI design based on Widget The components of this article are examples, discuss and focus on the UI design and implementation of the Jiuguan program of a traditional mobile application. Design UI on the BlackBerry platform requires consideration and borrowing technology, better packaging BlackBerry By discussing the UI application, this paper also involves integration of how to apply Library and third-party applications in BlackBerry application development. The knowledge of network application development on BlackBerry, the reference documentation involved in the text can be developed from RIM China Download it on the forum. When reading and refer to this document, the reader should have some understanding of the basic tools and development processes on BlackBerry, if you want See these contents, please refer to BlackBerry China.