In the process of laser design and use,the observed structure of the laser mounting plate can play a key role in stability of the laser output power.When applying a certain screw preload to the mounting plate,deformation of the mounting plate would generally result in the laser output power with varying degrees of change.In order to reduce the impact of the mounting plate deformation to laser output power stability,three mounting plates with different structures are designed to simulate the deformation of applying a certain screw preload by using the finite element analysis,respectively,and the corresponding output power is measured in several cases through experiments.The results of simulation and experiment show that,compared to the structure of untreated mounting plate and perforated mounting plate,the output power of the laser with side slotted mounting plate structure is relatively stable in the case of applying a certain screw preload.Therefore,the side slotted structure is a more stable and reliable laser mounting plate structure.