Abstract:Threedimensional relationship is much more complex than twodimensional. The buffer analysis of their functions is also operated based on twodimensional datas.3D buffer pipeline construction has not been realized entirely. It is not real analysis of 3D buffer. In this paper, by using the method of cross section and decent triangulation fitting, 3D model including buffer pipeline point, line and body has been constructed based on OpenGL. It has realized the analysis on pipeline buffer entity, and verified the correctness and effectiveness of buffer analysis algorithm.