Abstract: The OODM is a user interface management system which is mainly used to create and improve user interface prototypes rapidly. In this paper, we present a new UI structural model——form-independent model, which becomes the theoritical basis of OODM development. the OODM does not need textual specification language for user interface. It user the direct manipulation techniques together with object-oriented method, visual prograrnming thchniques and constraint techniques to construct the UI prototypes. The paper introduces the design methods of OODM UIMS.