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The fault tree analysis(FTA) is an important method of analyzing reliability and safety of the system.It combines the advantages of both qualitative and quantitative model,and provides an effective way to find faults in complex systems.Through analyzing the reasons of typical faults for mine gas monitoring system,a fault tree mode of mine gas monitoring system is established.Qualitative analysis is made on fault tree and its structure importance is obtained.Qualitative analysis is also been done,and the result of fault tree is analyzed.Finally,the weakest failure factors are found out and occurrence probability of failure cause is determined.Corresponding corrective measures are also taken to improve the reliability and safety of mine gas monitoring system.