Abstract: In order to investigate the melt removal effects of the metal plate under laser irradiation, a three-dimensional thermal model based on finite volume method(FVM) was constructed. The model employs a database of material properties, such as the heat capacity, the thermal conductivity, and the absorptivity. An important feature of these properties is their temperature dependence. As molten metal would be carried out of the surface by the airflow, the boundary condition control volumes and iterative algorithm were modified and the finite volume equation could be solved in irregular domain. Also a three dimensional program code was developed with Fortran language. It was found that the program can perform a high-accuracy simulation of airflow-induced melt removal effects of metal plate under laser irradiation.