The coal mines equipped gas monitoring system also occurred many mine gas accidents, three main causes of accident causes is analyzed, the main causes includes regulatory regime of monitoring system is confusion, quality of technicians is not high, gas monitoring system have defects. And accordance with the existing problems, four improvement measures is introduced, the measures includes improve the regulatory regime of monitoring system, improved quality of staff, strengthening the monitoring system upgrades and routine maintenance, established emergency plan of unexpected incidents. At last, the above measures can be taken to improve the safety management level of mine gas monitoring system, decrease mine gas explosion accident.