In view of the problem that cladding defects are easy to occur when laser cladding is used to repair the tooth surface of small modulus gear, which affects the quality of repair, the equipment and process of laser machining of small modulus gear are summarized and analyzed by using the conflict resolution principle of TRIZ theory. The corresponding innovative process method and optimization route are then obtained. Through the evaluation model, the best innovation principle is selected, and the solution of physical contradiction is finally adopted to effectively distribute the beam energy, and the original single beam is changed to multiple beams. The beam with different energy density is applied to different parts to effectively improve the characteristics of Gaussian light source. Experimental verification to get through a single variable method, under the double channel diameter 1 mm spot of laser cladding coating microtek austenitic precipitation less, granular cementite precipitate is more, the coating hardness and wear resistance is higher than single channel laser cladding, the tooth surface has higher resistance to agglutination, pitting and wear resistance, strength of gear tooth surface after repairing process requirements.