Abstract: The paper introduces the problems existed in the vaccum system (the accessory system of centrifugal pump)when the vaccum system is used on the light oil loading/unloading process at tank farm, and with some parameters and technological process, the paper describes the application perspective of the YQ type LPG pump substituting for the vaccum system. The YQ type LPG pump has some features in safety, relia- bility, good seal and wide availability, meanwhile, the operation efficiency goes high by means of eliminating accessory vacuating system and heating device, which make the design and construction simple, operation convenient, the equipment's investments declined, and construction and/or operation costs reduced. In this way, the air-lock occured in summer can be solved, and moreover, the favourable conditions can be provided for the LPG pump system's automatization.