We propose an image fusion method based on infrared and visible images. The two cameras in the optical imaging system use the same optical axis. Laplacian pyramid transform is used to fuse the infrared and visible images. Then the fused image is combined with the infrared image to obtain the pseudo-color fusion image in YUV space. Experimental results show that the proposed method based on the fusion of infrared and visible images enhances the image information and highlight the specific target in the image significantly, and can get good results at a variety of environment conditions.