The purpose of Architecture Modeling System is to the pursuit of a high quality design by speeding up each simulation process of architecture designing, using modelised information. For it's build-up, it is important to notice the methods of analysis, definitions and arrangements of each architectural stage while keeping in mind the specialities of the building design process. This paper reports on the Architectural CAEsystem, 'COMPASS' which we are now developing, and the idea of it's modeling system and the multi-usage of it's modeling data.