Abstract: Colliery gas accidents in recent 10 years were analyzed, and numbers of accidents and deaths accounted for 62.3% and 66.5% respectively. The placement methods of coal and gas outburst alarm sensors of methane, wind speed, wind direction were put forward. Coal and gas outburst alarm methods were proposed based on coal mine safety monitoring system, namely monitoring and analyzing methane, wind direction, wind speed and sensor fault, specifically, sending out sound and light alarm signal, cutting off all power supply for intrinsically safe electrical equipment in coal mine, and pulling out of coal mine workers in the following cases: wind speed is normal and methane concentration increases rapidly or exceeds alarm concentration; wind direction reverses in intake airway and methane concentration increases rapidly or exceeds alarm concentration; and methane concentrations in intake airway increases quickly or exceeds alarm concentration.