Spaceborne-airborne hybrid bistatic SAR is translational variant bistatic SAR.So the traditional algorithms are no longer suitable any more.An imaging algorithm is proposed in this paper

which suitable for Spaceborne-airborne hybrid bistatic SAR.The main idea of this method is that:decomposing the imaging space into several linearity regions

and expanding the range history in space domain in every region;find the differences of ehco sinals between reference point and other points in the regions

which can be used to reduce the computational cost.Then SIFFT is used to correcting the RM

after that the phenomenon of non-uniformly-spaced is analyzed and corrected.At last the final imaging is finished using range-dividing

and the validity of this algorithm is prooved.