Abstract: The study of graphical software standards is an important subject of computer graphics. The great achievement is that GKS was received as the two dimensional international standard. Meanwhile, studies of three dimensional graphical software standards are just unfolding. In this article we try to analyse and compare the advantages and disadvantages of the existing draft of 3 D standards——CORE, GKS-3 D, PHIGS, and then some new issues about the subject are presented.