Abstract: A three-dimensional transient state finite element model of the temperature field of laser milling has been established based on ANSYS software. As an example, Al2O3 ceramic material has been milled by laser to simulate the temperature field. The dynamic distribution of the temperature field was simulated during the laser milling process. A group data were chosen to analyze the change orderliness of the temperature on the sample surface. The milling width and depth were determined along different scanning route. An indirect verification method was put forward to test the result of the simulation. The milling layer width and depth of the temperature simulation were compared with the experimental data. The result shows all the data can be coincided, which show the finite element model can predict the effect of laser milling.