Abstract: Mainly introduces a manual pressurized liquid nitrogen pump which had got a state patent for utility model.CooPerating with liquid nitrogen biological container which is up to standard GB5458,the pump is used to transport liquid nitrogen to other liquid nitrogen container such as Dewer,（liquid nitrogen）cooling trap elc.Advantages and disadvantages of various liquid nitrogen transport n1ethod are discussed.The principle, structure and technical specification of the pun1p are presented.Test results determine the main technical speclfication of the pump:everage flow 4.16L/min,lift＞2m,transportefficiency 95%,mass 1.6kg. Working results show the pump has followii1g advantages:simple structure,light weight, reliable seal,convenient for handle,larger flow rate, stable performance in continuous operation, and light transport efficiency etc.Th0refore,it is a quite ideal equipment for liquid nitrogen transport.