As an engineering aided design software, AutoCAD possesses the advantages of wide coverage for users, engineers′ skilled application, is easy to convert between three-dimensional and two-dimensional space conversion. This paper studied the modeling problems of AutoCAD technology of RCC pouring simulation system base on the analysis of the problems exist in RCC pouring simulation system. A simulation platform has also been developed by applying visual basic and activeX technology. This platform embeded the RCC pouring simulation into AutoCAD system, and made the designers who were familiar with AutoCAD build simulation models and analyze simulation results easily. This platform also improved efficiency of building simulation models and the visualization level in this period. At last, the validity of the simulation platform was verified by a project instance.