Abstract: The traditional Mond method does not apply to the risk evaluation of devices itself, so in this paper, according to the characteristics of complex process of gas compressor station, an improved Mond method to perform evaluation on its risk level is adopted, adding equipment correction factor F_E, device management coefficient F_M, similar equipment failure frequency F_G as evaluation items, dividing the gas compressor station into several evaluation units according to the process characteristics of gas compressor station, and evaluation with the improved Mond method is performed through taking purification units as a case, quantitative calculation of various safety indicators for the purification unit is made, and compensation evaluation on the safety management system of gas compressor station is completed in combination with gas compressor station, and the difference between various risk factors before and after compensation is compared. The results show that the application of the improved Mond method can be used to evaluate the risk level of gas compressor station in a more accurate way.