We aimed at the release and dynamic management of CAD network graphics library (NGL). Thecharacteristics of realization on network of CAD graphics are analysed, while the existing problems of thepresenting share methods of graphics file are also discussed. Release and dynamic management are accomplishedwith the B/S combined with C/S as well as the file organization based on attribute information, which haveessential practical sense to the establishment of CAD NGL, share and cooperation in tech-design as well as thedistance education of engineering graphics.