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A fusion processing of remote sensing image data is carried out based on IHS principle, by using MATLAB experiment tool, in order to resolve the problem which can not give consideration to both the spatial resolution and spectral information in remote sensing. This paper proposes a fusion method by combining generalized intensity-hue-saturation (GIHS) transformation and maximum a posteriori (MAP) analysis in order to improve the fusion quality of multispectral (MS) and panchromatic (Pan) images from a new type of remote sensing platforms. The proposed method is compared with the GIHS fusion method, the wavelet transform (WT) fusion method, and the combined WT-GIHS fusion method. The experimental results show that the proposed method can achieve better fusion A. result than exiting fusion methods.