Abstract: This paper describes the management and the concurrency of user intefaces, designs and implements a user interface generation tool——UIGT based on ETN (Expansive Transition Network)/EVENT hybrid model. The kernel of UIGT is a pewerful environment of interactive edit and a recursive tool of automatic generation. The interactive editor accomplishes a flexible design of dialogue box, text window, graphic window, complexicon, pop-up menu, and expansive model etc., and the automatic generator employes a group of event controllers and implements the interfaces of application programs with various demands. Now, UIGT has successfully been used for the design of several integrated systems.