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SmCo5 sintered magnets with good thermal stability are mainly used in high-temperature field.In this study,two types of SmCoz powders with different nominal z values were mixed and synthesized into SmCo5 magnets by the traditional powder metallurgy method.The mag-netic properties of the SmCo5 sintered magnet are maxi-mum energy product of(BH)max = 172.29 kJ·m-3,remanence of Br = 7.47 × 105 A?m-1 and coercivity of Hci = 2.42 T.The results show that there are three coex-isting phases in the magnet,which are SmCo5 phase,Sm2Co7 phase and Sm2O3 phase.The microstructural observation indicates that the average grain size in the magnet is about 8 μm,and the high coercivity of this magnet is attributed to these fine grains.X-ray diffraction(XRD)and electron backscatter diffraction(EBSD)results indicate that the magnet has a well-aligned(00l)orientation texture.