Along with the progress of the science and technology, more and more attentions were paid to Convergence Communication. Therefore, many products based Convergence Communication emerged. Nowadays, UX(User Experience) becomes more and more important. However, the traditional develop-mode of UI interface has the problem that UI is tightly coupled with business logic, which can't meet the demands of the ICT products' UI interface. A UI Library based on DirectUI is proposed, which decouples the UI interface and business logic. The architecture design and each module of the UI Library are described. What's more, the formulation of the user interface description language and the design of the message mechanism are detailed explained. The characteristics of the UI Library are proved by an ICT instance.