The stability of the laser resonator affects the spot distribution of the output laser and the stability of the optical axis,thus affecting the ranging power.In this paper,the deformation of laser resonator before and after adding sub plate structure is compared and analyzed from the point of view of engineering practice.Through simulation analysis and experiment,it is proved that the stability of the resonator can be greatly improved by adding the auxiliary plate structure.This conclusion can be used to guide the structural design of laser emitters.