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This paper describes the algorithm used for remote sensing image, and then fused image from a mathematical point of view of the cause of spectral distortion, and to explore the spatial resolution of the fused image enhancement and spectral information to maintain the relationship between the two, the last imaging for multi-spectral image characteristics, respectively, based on region features multi-spectral and panchromatic image fusion algorithms and SAR and panchromatic image fusion algorithm, and describes the characteristics of remote sensing image based on regional integration and the latest trends.