The course of rock mechanic is an engineering subject with very strong practicality; the performance of experiment teaching has considerable effects on its teaching quality. In this paper, aiming at the problems that the present experimental conditions fail to meet the demand set by the enrollment expansion, the numerical experiment teaching system with its characteristics and applications is introduced. Compared with the traditional experimental teaching mode, this new one is considered to be more helpful for students to understand and grasp the knowledge as well as solve the problems including the shortage of teaching fund, insufficient experimental equipments, obsolete equipments, etc, and can well meet the demand by enrollment expansion.