Abstract: The research on NiTi shape memory alloys of functional material has been mainly concentrated on the field of material.For the use as driving component in initiative deforming structure,the performances of the alloys,such as mechanics,electricity,calorifics etc,during the phase transformation are necessary to be investigated.In this paper,the performances and parameter of NiTi shape memory alloys with different initial microstrncture were researched throngh experiment,to lay a foundation for understanding the driving mechanism of shape memory alloys and controlling the driving action,and provide reference for the design and fabrication of shape memory alloys driver.