Abstract: A laser cladding method was adopted to fabricate a Ni625 alloy repair layer on the surface of 17-4PH stainless steel, which was commonly used for the final stage blades of steam turbines. Furthermore, ultrasonic rolling technology was utilized to strengthen the surface of the cladding layer. Firstly, the interfacial bonding, hardness distribution and microstructure of laser cladding layer were analyzed. Then the effects of ultrasonic rolling on surface properties such as hardness, wear resistance and corrosion resistance of the cladding layer were studied. The results show that the Ni625 alloy cladding layer has good bonding with matrix, and the cladding layer is dense without defects such as cracks and holes. Ultrasonic rolling treatment significantly enhances the surface hardness of the cladding layer, with a hardening depth of approximately 80 μm. After friction and wear for 10 min under the same test conditions, the average wear mass loss of the ultrasonic rolling treated sample is reduced by 0.5 mg compared with the untreated sample, and the friction coefficient is reduced from 0.691 to 0.514. The ultrasonic rolling treatment improves the wear resistance of the cladding layer surface. The self-corrosion potential of Ni625 cladding layer increases and the corrosion current density decreases after ultrasonic rolling, indicating that ultrasonic rolling improves the surface corrosion resistance of cladding layer.