As a basic tool for signal processing in Synthetic Aperture Radar (SAR), raw data simulation plays a significant role in those complicated configurations in which the real raw data is difficult to obtain. For the new and special configuration in Bistatic Forward-looking High-speed Maneuvering-platform SAR (BFHM-SAR), the double square roots and high-order terms in range history caused by high velocities and accelerations from both platforms make it difficult to gain the corresponding 2-dimensional frequency spectrum (2-D FS) effectively. In addition, space variances in phase terms of 2-D FS owing to curvilinear trajectories and different traveling directions of two platforms influence the accuracy of echo data significantly. In this paper, a fast and effective scene raw data simulator is developed based on the effectual access of 2-D FS with high precision and quantificational analysis and correction of phase space variance of it. As the inverse process of imaging, raw signal can be reconstructed and generated by this method more efficiently than traditional approaches nearly without sacrificing accuracy. Plenty of simulation results for scattering targets and real scene verify its validity and effectiveness. Moreover, our method can be applied for handling the simulation in the conventional airborne platform of bistatic SAR besides BFHM-SAR.