EMI problems in power electronics equipment keeps on increasing when power electronics device widely used. As the important component of power electronics equipment, EMI caused by phase switching in three-phase rectifier not only affected normal operation of its connected equipment but also polluted public grid system. EMI in AC and DC of three-phase rectifier were analyzed in detail. The equivalent circuit models of EMI in AC and DC of three-phase rectifier were built and the mathematics description in S domain of EMI was deduced. And the prediction frequency spectrum of EMI in three-phase rectifier was programmed by MATLAB, which could provide theoretical basis for design of EMI filters
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