Abstract: Laser remelting on the surface of Cr12 steel was performed with CO2 laser.The bending strength and wear resistance of Cr12 before and after laser surface remelting were compared.Fractorgraphy and TEM of microstructure in the remelting layer were studied by electron microscope.Austenitic distribution of the laser remelting layer as a function of distance from surface was measured with X-ray diffractometer.The experimental results show that super-refined microstructure is formed in the remelting layer.The bending strength and wear resistance are enhanced evidently.Plenty of dislocation cluster are found in the TEM of microstructure in the remelting layer after the bending strength and wear test.Super-refined microstructure,strain-induced martensite transformation in the retained austenite and formation of dislocation cluster are the important reasons to reinforce the bending strength and wear resistance.