Abstract: A new type three stage pulse tube refrigerator which has been successfully develooed in Japan is presented.This set up can improve the refrigerators performance and simplify the structures.To reduce the losses of a regenrator and a pulse tube,a pulse tube has been developed which can work at temperatures from a room temperature tO LHe temperature。This pulse tube refrigerator is capable of achieving the low temperature of 3.6K,and a caljacity of 119mW at 0.9K.