The theory of pixel level image fusion method based on simple method, pyramid decomposition and wavelet decomposition is described in this paper. In addition, based on the existing infrared and visible image fusion method, an improved image fusion algorithm based on wavelet of edge detection has been presented. The fusion effect was evaluated. The experimental result shows that the infrared and visible image fusion with this method can provide more effective information to improve the image resolution effect and the detecting and recognition probability of the human eye to scenes of target. The fusion results are ideal.