The flash gas compressor of the certain combined station in Tazhong has frequent failures, and the accessories such as compression cylinders and gas valves are seriously worn and have a low service life.The main reason is that there are a lot of solid-liquid impurities and heavy hydrocarbon components in the flash gas,which cannot be handled by the inlet separator of the compressor effectively, resulting in abnormal wear of the main accessories such as the compression cylinder.The effective separation of solid-liquid impurities and heavy hydrocarbon components is achieved by improving the separation capacity of the separator and optimizing the process flow of the second and third stage pressurized inlet of the flash gas compressor. The failure rate of flash gas compressors has been reduced by 95% andthe abnormal wear of compression cylinders, gas valves and other accessories has been effectively restrained.The service life is increasedand the natural gas discharge volume is reduced as well, and the equipment maintenance cost is saved. This technology can provide reference for similar conditions.