In the conventional Synthetic Aperture Radar and Ground Moving Target Indication (SAR/GMTI) system, the excessively high azimuth velocity may cause velocity ambiguity.To solve the problem of radial velocity ambiguity of moving target, a kind of multi-channel interferometric of SAR/GMTI scheme is presented.By setting up four receiving channels with non-uniform intervals and designing each channel spacing reasonably, the method carries out interferometric cancellation respectively on the sub-images of two echo signals.Then, two velocity sets are obtained, and the intersection of the two sets is the correct estimation of the target velocity.Therefore, the problem of velocity ambiguity is solved and the radial velocity of the target is estimated correctly.The validity of the method has been demonstrated by analysis and computer simulation.