A design scheme of electromagnetic pulse radiation system is proposed. The system consists of a Marx generator, a chopping-peaking combination switch pulse forming line and a high-power ultra-wideband Transverse Electro-Magnetic(TEM) wave horn antenna with low-frequency compensation. The unipolar pulse generated by the Marx generator is formed into bipolar pulse by the chopping-peaking combination switch pulse forming line, and then fed into the antenna for radiation. The simulation results show that the electromagnetic pulse source can generate bipolar pulse with pulse width of 1.41 ns and peak power of 7.69 MW when the charging voltage is 10 kV. This bipolar pulse spectrum is mainly distributed in the frequency range of 0-1.6 GHz. The antenna bandwidth of high-power ultra-wideband TEM horn antenna is 0.625?2.9 GHz(the relative bandwidth is 129%) and the power capacity of the antenna can achieve 10 MW, which can effectively radiate bipolar pulses generated by electromagnetic pulse source.