The blacken way and laser parameters of technology for QT60-2 have been optimized. The regression equations on the depth and width of the hardened layer between technology parameters have been set up resoectively. The camshaft in C4102 diesel engine has been been heated with laser. The results show that the average depth of hardened layer is more than 0. 31mm, the average hardness on surface is no lower than Hv0.1940,and the maximum deformation of radial rake is controlled within 0. 02mm.