Abstract: In order to study the reliability of the ventilation and gas drainage system of coal mine tunneling face with long links, more equipment and a large number of random influencing factors, then, improvement measures are adopted to reduce the occurrence of gas accidents. On the basis of the fault statistics of the air exhaust gas system in the driving face of coal mine, the reliability of the system is analyzed by using the reliability engineering theory, and the reliability indexes of each component are obtained. The weak link of system operation is found out and the targeted measures are proposed.