Abstract: A PC integrated design system,EngineCAD is introduced, which can be applied to development and improvement of aeroengine.This system can complete quickly,the realtime parametric design of turbojet,turbofan,turboprop and turboshaft engine and its parts.During designing the required information,data and structural graphics can be inquired interactively from Aeroengine Information Database and Structure Database.It is shown that the system can shorten the design period,reduce the development costs and improve the design quality of aeroengine greatly.