China has entered a period of rapid development in LNG industry. LNG compressor is a core rotating equipment in LNG treatment process. Described is technological process in LNG treatment plant and technological requirements and characteristics of such media as feed gas, regeneration gas, natural gas liquefaction refrigerant in molecular sieve dehydration unit during BOG pressurization process. Combined with characters and application range of common compressor, proposed are principle and method of LNG compressor type selection, compressor drive mode selection and cooling mode selection in LNG treatment process, which can provide useful reference for drive mode selection of compressor and associated equipment and cooling mode selection in LNG treatment plant.