The paper applies the standing-traveling wave boundary condition to the PSTD method to replace the PML.In this boundary condition,electric or magnetic walls are placed around the domain to be calculated,and the reflection field is removed from the scattering incident wave.The formulation for the method in the condition of 2D is given. The method can save more memory and time than that of the PML when their results are compared. The numerical result shows that the new method is feasible.