Abstract: In order to understand the influence of the tangential airflow on the thermal response of resin composite irradiated by laser, the convective heat transfer coefficient and the blanketing effect are studied by the heat transfer theory of boundary layer, and the one-dimensional thermal response model of resin composite irradiated by laser is solved with finite difference method. The simulation results indicate that the high-speed tangential airflow increases the convective heat exchange of the target surface, consequently reduces the heating efficiency of the laser obviously. The convective heat transfer coefficient and the blanketing factor base on the heat transfer theory of boundary layer are proper, and are suitable for numerical simulation of tangential airflow impacting on the thermal