本文讲述在土木工程优化设计过程中，应用可视化技术的必段性与其独特的优点；作者给出一种可视化实现的具体步骤；简要说明了几种常用的可视化操作；结合实际工程，应用光线投射算法，解决不规则网格结构的体绘制问题，同时给出了该算法在拱坝优化设计中的应用实例． This paper describes the necessity of applying visualization technology and its unique advantages in the process of civil engineering design optimization. The author gives a concrete step of visualization implementation, briefly describes several commonly used visualization operations, and combines practical projects with light projection Algorithm to solve the problem of volume rendering of irregular grid structure. At the same time, an example of its application in arch dam optimization design is given.