Abstract: In this paper, we put forward application solutions using CATIA-based BIM in the simply supported bridge by discussing the methods and results of CATIA applied in the simply-supported T-type bridge. With the combination of practical engineering and CATIA, we put forward a basic process-"data naming rule definition—> data structure division—> skeleton structures—> parameter, function, modular design—> quantity statistics—> engineering drawing"-of establishing a model which improves the design efficiency greatly and provides convenience for query and management of model data in the later stage.