In order to repair broken disc cam and improve the mechanical properties of its surface, such as wear resistance, corrosion resistance, anti-compression,laser cladding coating was made on the surface of disc cam.The laser cladding on complex disc cam was studied .For acquiring the uniform cladding on the surface of disc cam ,some basical conditions which must be followed during the laser cladding on the complex disc cam was put forward. As to meet these condtions, formulas which were used in the moving control of laser cladding on the surface of disc cam were deduced.At last, cladding of disc cam was analyzed by the microscope,scanning electron microscope(SEM) and other equipments,and the experimental results show that the process method provides cladding with uniform width and thickness and solid combination.The hardness of disc cam surface is increased by two-three times.