It is necessary to plan scientificaly and efficiently by using computer. But, it is not easy to use computers such that, because of poor knowledge for them, or insufficient data, etc. Therefore, to bring a solution, we developed the city planning support system. Up to date, SD model takes long time and prodigious labor. Our system dynamic model building support system can produce effectual and various information to build SD models. In this paper, we introduce the outline of this system. This system consists of three parts, there are Data base systems for city planning, SD model base and SD model management system. From the Data base systems, we set data to analyse for model building. SD model base system, we use for initial condition model of this system. The model management system compiles the SD model, interface to planners, etc.
