In order to assess pulse wave shielding effectiveness of shielding room from the traditional Continuous Wave(CW) test results，a frequency response function method was proposed. Taking the measurement of shielding effectiveness for pulsed magnetic field as an example，experiments and analysis were carried out to verify the effects of the above-mentioned approach. The result showed that the estimated pulse inside shielding enclosure was close to the real measured waveforms. This technology provides an effective mean for the conversion of CW measurement results to pulsed field shielding effectiveness.