Abstract: In this paper, a novel way that can be combined with FDTD methods to deal with the EMP response on thin wire with resistance load is developed, in which the thin wire is divided into three parts and described by different partial differential equations,respectively. This method can be used to calculate some coupling problems involving thin wires, which usually connected with circuit input or output ports. The dissipated energy and power on the equivalent resistance can be obtained. The results gotten from this new method are compared with the results from references,some typical results are given and analyzed as an example. Modified partly this algorithm can also be used to solve the nonresistance load cases．