crossing sign
3.Abstract: In view of the infiltration of information technology into engineering design,the modern de sign technology(MDT) system is established which contains four levels—basic tec hnology,main part technology,supporting technology and application technology.Th e MDT is based upon knowlodge system and adopts various scientific and technolog ical methods for designing products,and the CAD technology is its main technolog y.The MDT is the development of traditional design technology and is the result of crossing and synthesizing of several subjects with a series of features,which are fully explained.

