In order to find a solution to the low development efficiency and difficult optimization of the the online examination and approval system,this paper presents a development approach which is based on Model Driven Architecture. A government department subsystem is given as a case study to focus the analysis and design of this approach. Practice has proved that this method overcomes the shortcomings brought on by the traditional development approach and promises the consistency of all the subsystems. So it is an especially suitable method for the system.