利用透视投影理论，对立体模型表面可视性、排序、多边形填充等算法作了数学分析．通过对立体模型的数据建立、表面可视性计算、立体模型到平面的映射、多边形填充等步骤，实现了立体模型的计算机显示．结合这一理论，用Ｃ语言编制程序，实现了三维建筑图的计算机模拟显示． Using the perspective projection theory, mathematical analysis is made on the surface visibility, sorting, polygon filling and other algorithms of the three-dimensional model. Through the three-dimensional model of data creation, surface visibility calculation, the three-dimensional model to the plane mapping, polygon filling and other steps to achieve a three-dimensional model of the computer display. Combined with this theory, using C language programming, the realization of the three-dimensional architectural drawings of the computer simulation shows.