By analyzing the material characteristics, usage conditions, service conditions, and other factors of quenched parts, the technical conditions and product quality requirements are clarified, and then the laser quenching hardening model is selected and the laser quenching process parameters are determined. At the same time, the operability, production efficiency, and economic benefits of the process should also be considered. The laser beam mode is divided into multimode beam, low-order mode beam, and fundamental mode beam, which are generally used for laser heat treatment.