Abstract: In order to meet the requirements of materials shielding effectiveness (SE) measurement against strong electromagnetic pulse(EMP),a testing system of materials against EMP based on shielding black-box windows method was developed. Firstly, a certain metal fabric material was tested in the frequency domain using continuous wave. It is calculated the material SE in the frequency by testing the inner field intensity when unload and load the material. Then, in the time domain testing, the material peak SE was been calculated against the fast rise time EMP under the strong field. The SE curve is observed by the noise reduction processing and FFT for the captured signal, and the result was basically matched the previous experimental result obtained in the frequency domain. The experiments show that the test system is reliable for evaluation of materials SE against strong electromagnetic pulse.