Abstract: Designs and implements a specified CASE platform to support multi UI application design, and represents a new and useful way to generate codes automatically in this CASE platform. Based on illustrating extended finite state machines (EFSMs) for automatic code generation, a simple example is presented to introduce a process of abstracting resources and building an EFSMs model until the generating codes. In this way is ensured the feasibility of the code generation mechanism based on EFSMs for multi UI application platform.