Abstract: From the viewpoint of software engineering, traditional software developing life cycle （SDLC） is divided into several phases, such as user definition, requirement analysis, system design, system testing, etc.. This is a proper way for the design of standalone systems. But, in the developing environment of client/server systems, there are many components, which can be developed concurrently and interactively. Traditional methods can’t fully fit the features of client/server environments. A new developing method for client/server systems——the MILESTONE based procedure model is introduced.