At present, the construction industry faces problems of insufficient innovation ability and insufficient informatization application. However, the traditional two-dimensional building planning, design, and deepening processing of curtain encounters the issues including: low efficiency, poor information integration and sharing. Through BIM technology simulation, deepening stage division, and ProE+CAM system application, etc. This paper introduces the BIM application implementation route in detail from the aspects e.g. silhouette planning and performance verification, curtain wall scheme design, deepening and processing, etc. The results from the practice in an urban complex project show that this method can assist the comparison selection and performance analysis of building schemes, which can improve the efficiency of curtain wall deepening processing.