Abstract: In view of problem that conventional coal and gas outburst forecasting technology used a single forecast indicator and cannot considering outburst risk factors synthetically, the paper designed a comprehensive early warning system of coal and gas outburst, and gave structure and functions of the system, and introduced application processes of the system taking Longshan Coal Mine as an example. The practical application results show that the early warning system can effectively detect dangerous area and realize early warning of coal and gas outburst.