Micro seismic phenomenon is an important information before fracturing of rock mass; studies of micro seismic characteristics of the fracturing process of rock mass are of important significance for prediction of fracturing and destabilizing of rock mass and guaranteeing the safety of mine production. The coal mine underground micro seismic monitoring system which is made by Shandong University of Science and Technology is used to monitor the behavior of overburden strata of mining face. The close relationship between evolvement of micro seismic and fracturing of the overburden strata is proved by location of the monitored micro seismic events. The fracturing of rock mass can be precisely predicted according to the change law of finite difference of frequency

energy and distance of micro seismic events. This is of important instructing significance for prediction of rupture and instability of the rock mass underground coal mine by micro seismic monitor technology.