Abstract: A new method for modeling moving and perfectly conducting objects is proposed using a numerical technique based on the finite-difference time domain (FD-TD) method. Contrary to any other method, the numerical technique used does not require a coordinate transformation, the linear interpolation for the value of the incident field at the interface between the two different materials, and the determining of the position of the total field. This leads to saving calculation amount and CPU time. The electromagnetic wave scattering properties of a moving and perfectly conducting surface are analyzed using the numerical technique. Results obtained are given to show the high accuracy and efficiency of this new technique.