To pick-up information from the image, the pretreatment towards the image is necessary. Based on the contrast from the traditional edge detection, the theory of wavelet transform is introduced and studied. Then the image is smoothed through wavelet transforming. Meanwhile, the edge information of the image is intensified using the transforming. This paper proposes a new mage fusion method based on wavelet transform. Across the computer simulation, it’s educed that the result of edge detection based on wavelet transform is much better than the traditional edge detection.