To process the multi-spectral images registration of the same sensors, a fast and effective automatic image registration algorithm is presented. The control points of the reference image and matching image are extracted by Forstner operator, the corresponding image points are matched by the algorithm based on the gray correlation, and then the parameter of the affine transform is calculated according to the corresponding image points. The multi-spectral images registration is achieved. The registration result of multi-spectral images of the liquid-crystal spectral camera proves that the algorithm is efficient and accurate.