Abstract：Microseismic monitoring technique is a main means of ground pressure monitoring for deep mines. The occurrence，the ground pressure characteristics and hazards of deep orebody at Fankou mine are summarized briefly. The composition and performance of 16-channel microseismic monitoring system established recently in the mine and the monitoring area are introduced in detail. Optimal analysis of layout of sensors gives the optimized results of sensors positions presented through an isogram of the source location. Source location errors are tested through artificial blasts. The test data and the monitoring source location figure are presented. The tested results are compared with those of theoretical results determined by the monitoring system. The compared results show a smaller locating error of less than 5 meters within sensors array and the perfect source locating performance of the system. Large blasts aftershocks in deep mining area are monitored by this system. The results show that all monitored aftershocks occur in a few minutes after blasts，which means rock mass surrounding the mining area has a good stability condition at present.
