Abstract: The coating with high strength, high hardness and high wear resistance were prepared by laser cladding. The effect of ultrasonic power on the microstructure and properties was investigated through optical microscopy, SEM, XRD and MLS-23 wet sand rubber wheel tester. Meanwhile, the grain size was calculated by the Image-Pro Plus software. The results show the effect of ultrasonic power on microstructure and properties of the coating is very obvious. With the increasing of ultrasonic power, the grain size reduces from 87μm to 6μm, which has a strong correlation with obvious cavitation effect and acoustic stream. The hardness and relative wear resistance increase at first, then decrease. When the ultrasonic power is 1 000 W, the grain size is 6 μm. The hardness is very high, the value is 62 HRC. The relative wear resistance is very high, which is about 50 times than that of substrate.