Abstract: The article focuses on the method of using VB 6.0 on AutoCAD secondary development, and through an software instance of Pillarless sublevel caving digital generation system elaborates the process of using VB 6.0 on AutoCAD secondary development. This software can well solve the problems in the realization of mining methods graph in Pillarless sublevel caving and make the realization process automatically done to achieve satisfactory results.

Key words: AutoCAD, Secondary Development, VB, Mining Methods Graph, Automatically draw