This paper extends the nonlinear partial differential method in the field of the remote sensing image to magnification the scope of application, and research the post-processing on the remote sensing TM image magnifying using nearest neighbor interpolation, bilinear interpolation, cubic spline interpolation, cubic interpolation, biquad interpolation. For the reason that enlarge image causes jagging and fuzzying using interpolate algorithm, we address the model of color self-snake which has not only the function of sharpening edge and eliminating jagged edges but also the function of the direction of diffusion, that is to say the ability of denoising. In addition, the residual spots generated by post-processing was put on median filtering method then achieved better magnifying result, also for the remote sensing images which contain noise. Experiment shows the method is suitable for amplification about remote sensing image processing.