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Due to the complexity of SAR imaging of maneuvering platform, traditional imaging algorithms are unavailable in the diving stage with high squint angle. To deal with these problems, the geometric model in diving stage of high squint SAR is constructed and discussed in detail. Furthermore, the spectrum support zone is analyzed. Then, a wavenumber-domain imaging algorithm for high squint diving SAR based on axes rotation is proposed. The wave-number domain imaging processing for sub-aperture data obtains high-usage of spectrum by axes rotation to guarantee the resolution. By doing so, zero-pudding operations in imaging domain are decreased effectively, which lead to the promotion of efficiency. Simulation results and real data processing are presented to valid the superiority of the proposed approach.