When there is Doppler ambiguity number mutation, keystone formatting is no longer valid because of integration per-formance deterioration and false velocity estimation. A novel key-stone formatting method based on non-baseband interpolation is presented. It has a different half blind velocity range com-paring with normal keystone formatting.- Furthermore, there is non-superposition between half-blind-velocity-range of keystone formatting based on baseband and that of non-baseband interpo-lation. So a synthesizing keystone formatting is proposed to avoid the half-blind-velocity effect. Simulation results of the proposed method show that integration deterioration and velocity estimation falsity can be eliminated effectively.