Abstract: For better evaluating the shielding effectiveness of materials against electrostatic discharge (ESD) electro-magnetic pulse (EMP), a research on testing materials shielding effectiveness (SE) in time-domain was proposed. Combined with the homemade broadband coaxial test fixture, the SE time-domain measurement was performed on the metal fabric material under ESD EMP. The peak SE of the material was calculated through the obtained signals when unloaded or loaded the material. The amplitude-frequency curve obtained by the FFT was well matched with the one measured by a vector net-work. The results show that the time-domain system can be reliable for evaluating materials shielding effectiveness against ESD EMP.