为实现建筑师与声学设计者在同一平台下的合作,介绍了AutoCAD软件中计算前两次反射的方法.此方法是基于虚声源法,通过利用AutoCAD软件中的Auto LISP语言来实现的.运用此方法,文中得到了一个鞋盒式音乐厅和一个体育馆的反射墙面的覆盖范围及前两次反射声到达时间序列,结果验证了此方法的正确性和有效性. In order to realize the cooperation between architect and acoustic designer on the same platform, the method of calculating the first two reflections in AutoCAD software is introduced, which is based on the virtual sound source method by using Auto LISP language in AutoCAD software. Using this method, we obtain the coverage of a reflective wall of a shoebox concert hall and a gymnasium and the time series of the first two reflected sound arrival times. The results verify the correctness and validity of this method.