Abstract: Having studied Changes of hardness and surface roughness of strengthened layer of M2 (W6Mo5Cr4V2) high-speed steel before and after surffering laser melting quenching and first tempering of 570℃, and analyzed the processing position of M2 high speed steel shaping cutter laser melting. And discussed the microhardness changing rules of blade parts of tool after surffering laser strengthening and finishing. Experimental studies show that:samples get different surface hardness after laser melting quenching of different process parameters combinations. After surffering tempering once again, the sample surface exhibited significant secondary hardening effect and the roughness values is stable; The microhardness changing rules of face blade parts of pinion cutter has engineering applicability, and provides the experimental basis for selecting the best laser process parameters and process method.