Abstract: The spatial high-resolution synthetic aperture radar (SAR) puts forward very high requirements for bandwidth, output power and amplitude-phase consistency of the pulsed TWT amplifier. The kW class pulsed TWT amplifier based on broadband power combining is the key technology for space SAR applications. This paper studies the wideband high amplitude-phase consistency control technology and wideband power combining technology of the proposed amplifier. The space amplifier dual-channel power combining integrated architecture is proposed. More than 95% synthesis efficiency is achieved within 3 GHz bandwidth, and consistency of multiple products is less than ±10°.