By researching passageway, the features of passageway reinforcing design and draw are analyzed, and the mathematics model of orthogonal passageway and slant passageway are established. The method of applying CATIA V5 to hydro-structure is explored and a scheme of 3-D visual reinforcing CAD System is designed. It is proved by practice that the system is not only convenient to input parameter, but also to use universally. The system can use in design and researching of orthogonal passageway and slant passageway. It is very quick and easy that revise reinforcing bar of reinforcing drawing in construction.