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In the processing of SAR echo data imaging, RCMC is an important factor which affects the focusing effect of two-dimensional image compression. In this paper, we take the positive side of SAR imaging for example, and research the application of the nearest neighbor approximation and sinc interpolation algorithm in RD imaging. By computer simulation, we analyze and compare the computation and bending effects of the two interpolation methods, and apply them in the imaging process of Radarsat-1 satellite in Matlab environment. The results show that the nearest neighbor approximation is suitable for low precision requirements with the benefits of small computation, and sinc interpolation algorithm is more suitable for high accuracy requirements with more in- terpolation points.