This paper introduces the specification method for user-interfaces in a graphical User Interface Management System-GUIDE-GKS System. And the rapid prototyping and automatic generation technique for user-interfaces based on the specification information also are described. Among those, on the basis of the idea of the user s conceptual model, it presents a new kind of "guide" style specification technique, with which the user-interface designer can learn to use the system more conveniently, succinctly and effectively.This specification technique also enhances the guarantee of correctness foe the process of the user-interfaces'specification,and encourages the creation of good designs for user-interfaces by making tasks or activities that result in such designs easy to accomplish.