Abstract: A model of a plane target under laser irradiation is used to numerically simulate the temperature distribution in different speed airflow, using the thermal coupling method of gas and solid. The results show that there is a higher equilibrium temperature over the plane target when there is no laser irradiation, and the heat transfer coefficient between air and the plane target increases with the airflow speed; with a maximum value occurring at the front edge of the target, it declines along the target length. When under laser irradiation in different cases, the temperature distribution in the plane is analyzed carefully, and the influence of aerodynamic heating, forced convection cooling and laser heating is focused to compare their thermal competition，which shows that the temperature di