A novel self-regulated J-T cryocooler for infrared detector is introduced,shape memory alloy is used as regulated elements.Compared with the bellows self-regulated cryocooler,the cryocooler has the advantages of simple structure,easy adjustment,long life and good stability.Working principle of shape memory alloy and the cryocoolers structure are discussed.The current status and prospect of cryogenic shape memory alloy are introduced.