This study simulates the process of CO2 continuous laser polishing Ti6Al4V material,using the movable Gaussian heat source analog laser source,establishing a finite three-digit numerical transient model for simulation experiments,to simulate the melting and freezing process of the surface profile of the TC4 material,which coupled the temperature field with the velocity field,and studied the surface tension of the polished melting pool due to the surface tension temperature coefficient.The effect,by changing the different power strength of Gaussian light source,scanning speed,to analyze the impact on the melting pool formed in the polishing process,the simulation results show that:when the laser heat source power is too large,easy to cause the melt pool size is too large,is not conducive to reducing the roughness of the material surface,appropriately reduce the scanning speed can effectively reduce the height of the peak of the contour,thereby reducing the effect of surface tension,and thus improve the melting pool size and shape.Through the actual polishing experiment,it is concluded that the optimal scanning speed of the laser is maintained at about 20 mm/s,the scanning speed is too small or too large metropolis makes the surface roughness value of the polished sample increase,so as not to achieve the ideal polishing effect,and the experimental test value is compared with the numerical model calculation value,and the data of the two data are roughly consistent,thus proving the accuracy of the mathematical model.