A method of information fusion for collectivity multi-sensor remote sensing image is presented based on wavelet transform. The disadvantages of traditional information fusion method on spatial resolution is improved. The original image is transformed into sub-image with wavelet transform and each sub-image is divided into sub-blocks. The weighting value coeffients of high resolution images and low resolution images are computed according to collectivity square error rule, and then the high resolution image and low resolution image are fused and reconstructed. Afterwords, information fusion is made on both of the images with collectivity square error rule. Experimental results show that the method is workable to make low resolution image approaching high resolution image.