Abstract: The influence of sintering temperature on magnetic properties of rare earth permanent magnets Sm（Co_0.72Fe_0.15Cu_0.1Zr_0.03）_7.5,prepared by the conventional powder metallurgy method,was studied.The results show that with sintering temperature increasing,the remanence B_r,intrinsic coercivity H_ci and maximum magnetic energy product（BH）_max increase first and then decrease.Although the maximal value of B_r=0.95T B_r is achieved when the magnets are sintered at 1220℃,the optimal magnetic properties are achieved at 1212℃ with B_r=0.94T,H_ci=2276.6kA·m^-1 and（BH）_max=171.9kJ·m^-3.The temperature stability of magnets sintered at 1215℃ is excellent,which can work in the condition of 550℃.