In order to explore the influence of different power lasers on the temperature field distribution and cleaning depth of the aluminum alloy surface paint layer,as well as the effect of the spot overlap rate on the cleaning effect,the COMSOL multiphysics software is used to establish a numerical model of 5083 aluminum alloy surface paint layer with fiber pulse laser cleaning.Finally,the laser powers that can not only prevent the substrate surface from being damaged,but also make the coating material completely removed,as well as the spot lap ratio that can obtain good cleaning effect,are verified by experiments.The results show that when the laser repetition frequency is 100 kHz,the greater the laser power,the faster the temperature of the sample surface rises,and the ablation depth also increases.When the laser power of 30 W can basically ensure that the paint layer is removed without damaging the surface of the substrate and the ablation depth of the substrate material is 10μm.Under the experimental parameters with laser power of 30 W and spot overlap rate of 50%,the sample surface roughness is reduced to 4.48μmbefore cleaning.Thus,a good cleaning effect without damaging the aluminum alloy substrate can be obtained.The experimental results can provide a reference for the selection of process parameters of fiber pulse laser cleaning.