Abstract: An ultra-wideband radome design method is proposed for the complex configuration of multi-band synthetic aperture radar antennas with specific layout from P-band to Ka-band,which can meet the wideband efficient transmission for multiple antennas in different frequency bands with high inclination angles. According to the different layouts and frequency bands of the multi-band synthetic aperture radar antennas, a large assembled multi-layered radome with different permittivity combinations as the transmission areas is designed. The transmission coefficient of the radome manufactured by the proposed method is tested for the original layout of the multi-band synthetic aperture radar antenna under corresponding working conditions, and the results show that the radome would allow waves to penetrate efficiently in the ultra-wide band and fulfill the design requirements.