According to the width of a single laser quenching band, there are two types of laser quenching bands: narrow band and wide band; The distribution types of laser quenching strips include straight bar, spiral, sine wave, cross grid, circular ring, etc. One or more composite distribution types can be selected for laser quenching according to needs. At the same time, the distribution position of the laser quenched strip on the quenched surface and the hardening area ratio (the ratio of the total surface area of the laser quenched strip to the entire working surface area) should be determined.