It is essential to construct an accurate model consisting of both an equivalent circuit of electrical fast transients/burst（EFT/B）generator and a coupling device

so as to predict interference immunity performance of an electronic equipment under EFT/B test.In this paper

a modeling method of EFT/B generator is proposed based on the theory of latent roots.For the modeling of the interference source generator

a transfer function of EFT pulse-forming network is constructed by the latent-roots method based on the network theory

in which two negative real roots are adopted to characterize the non-oscillatory physical process of the network

and both conjugated complex roots are used to charac terize the damping-oscillation process.The parameters referring to the transfer function are determined according to the standardized waveforms of the generator in open-circuit condition.These standardized waveforms were provided by the manufacture of the generator.Subsequently

an equivalent circuit of EFT/B generator is constructed via synthesis of electrical network based on CAUER method and re-normalization calculation based on the matched standardized waveforms.For the modeling of the standard coupling clamp

a SPICE equivalent circuit is obtained from a macro model of the coupling network.The coupling network is constructed by the rational function approximation of the test results of the scattering parameters（S-parameters） based on the vector fitting method in a corresponding frequency band.The S-parameters at the ports of a coupling device are measured by a vector network analyzer.The proposed modeling method is verified by comparing the simulation results of differential-mode interference and common-mode interference of two parallel signal lines with the experimental data.