Since the find of giant magnetoresistance(GMR)in FePt films,researchers have been endeavoring in promoting this effect.So far,both the multilayered FePt films [1] and the addition of a third element [2] have already been investigated.In addition,the preparation conditions are also proposed to influence the film properties [3].For example,an appropriate sputtering atmosphere is proven to be important to improve the quality of targeted thin film in respect of microstructure and magnetism,which further affect significantly the magnetoresistance(MR)properties of the films.But the effect of sputter pressure on the MR of FePt films has been seldom studied yet.