This paper explains the theory and method of image fusion based on Laplacian pyramid.The Laplacian image fusion scheme begins by constructing Laplacian pyramids for each source image,and then each level of Laplacian pyramids is fused with different fusion rule.Finally,the end fused image is obtained by inverse Laplacian pyramid transform.By analyzing the fusion image with visible and infrared image,the experimental results show that this algorithm can produce high-contrast fusion image that are clearly more appealing and have greater useful information content.It proves that the algorithm can get a good fusion result.