The application of floating liquefied natural gas (FLNG) process, which can greatly reduce the processing load of subsea natural gas, has gradually attracting attention. Since the development of FLNG process is limited by construction cost, technical conditions, liquefaction yield and other aspects, the development trend of FLNG needs to optimize the process flow, lower construction costs and improve equipment capacity on the basis of meeting the criteria of light weight, small footprint and corrosion resistance. By comparing the three refrigeration processes, namely cascade refrigeration liquefaction process, expansion refrigeration cycle process and mixed refrigerant cycle process widely used in FLNG. The study found that the mixed refrigerant process has the advantages of shorter process flow, high liquefaction yield, ability to accept wider raw gas composition, saving energy and having high adaptability to complex sea conditions as compared with other liquefaction processes. The combination of mixed refrigerant with effective pretreatment process and Liquefied Natural Gas(LNG)unloading process has gradually become the dominant process for FLNG. This integrated process package is now widely used in offshore LNG production.