Abstract: The imported cryogenic horizontal centrifugal pump is widely used for LNG loading pump in domestic small and medium natural gas liquefaction plant. The pumps have some disadvantages, such as expensive price, easy leaking, large LNG loss, and complex installation and removal. The immersed pump was considered to be used for LNG loading pump, and the technical research and equipment development have been completed. Relying on actual LNG plant, the equipment performance testing was also finished to realize the localization and engineering of LNG loading pump.