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A new full-aperture imaging algorithm for Spaceborne/ Airborne hybrid sliding spotlight bistatic SAR is proposed in this paper. The SAR configuration under discussion has great advantage over traditional ones, yet suffers from the double square-root term in the bistatic slant range equation and severe spatial variance. The proposed method firstly eliminates azimuth spectrum folding by the SPECAN operation, and then corrects the RCM by Chirp Scaling Algorithm. Without interpolation and sub-aperture operations, the algorithm is high in the computational efficiency and simple in the flow. Simulation results confirm the validity of the proposed algorithm.