Aiming at many problems faced by hypersonic platform forward squint synthetic aperture radar ground moving targets indication: great range walk and Doppler center shift, severe rangeazimuth two-dimensional coupling, Doppler spectrum folding and envelope migration of echo signals, this paper proposes a double-channel clutter suppression method based on hypersonic platform forward squint sythetic aperture radar (SAR). Firstly, range walk correction and range pulse compression are performed to complete the distanceazimuth twodimensional decoupling, and the range channel phase deviation is compensated to achieve range envelope alignment. Then, a thirdorder azimuth chirp Fourier 〖JP2〗transform (CFT) is performed to fully compress the Doppler bandwidth of echo signals, and azimuth channel phase deviation is compensated to achieve azimuth envelope alignment. Finally, stationary clutters are suppressed and moving targets are preserved by displaced phase center antenna method in the range compression-azimuth CFT domain. This method can solve the problem of azimuth Doppler spectrum folding of echo signals, and it can also reduce the minimum detectable velocity of the moving target by half.