Abstract: In order to provide guidance for the comprehensive prevention and control of the mine gas, the control effect of fault to seam gas deposit was studied, fr om five aspects of the fault mechanics property, upper and foot wall lithology of the fault, fault size, fault depth and stress field of the modern structure, a gas geological analysis method was applied to the control effect of the strike normal fault to the seam gas deposit in Yanghe Minefiled boundary of Peigou Mine. The study results sho wed that the strike fault in Yanghe Minefield boundary was an open fault and would be beneficial to the gas release. The seam gas content in the central part of the Min efield far away from the fault in the boundary was high and the gas content in the deep part and the shallow part near the fault in the boundary was gradually reduced. Thus the seam gas deposit was obviously controlled by the fault.