GIS(Geographical Information System) has been used more and more widely in various fields. One of the most important application is that GIS is integrated with OIS(Office Information System) to form the so called Office GIS. Data flow diagram and control flow diagram are two approaches used in traditional software engineering

but they are not well suited to Office GIS. Base on the integrated expression of control flow and data flow

a new approach is proposed in this paper

which integrates data flow and control flow considering both spatial and attribute data in Office GIS. The quality and efficiency of system design are greatly improved by applying the approach in system designing of Office GIS

which proves that the approach is feasible and effective.