Abstract: A model of high power microwave(HPM)excitation with propagation attenuation is brought forward.A calculation method of electromagnetic transmission rate and reflectivity is proposed.A finite-difference time-domain(FDTD)film meshing algorithm is set forth. A shielded medium construction planted by transparent conductive film is designed by a new flow.Protection analysis on a 3D plane and pilot model with a scale of 1:1 against HPM is carried out.The simulation tests show the protection efficiency in the range of carrier frequencies and limit of the shielded construction with incident angle.