As the data of the original infrared image are easy to lose or weaken in compression transformation process,a kind of infrared image enhancement algorithm based on CLAHE(contrast limited adaptive histogram equalization)is proposed.Firstly,the pixel gray of original infrared image with 14 bit is adjusted,and then the based image is obtained by CLAHE algorithm.Secondly,image details are obtained through the difference of original image and the image after bilateral filtering,and the noise of detail image is filtered by Gaussian filter algorithm.Finally the output image is obtained.Simulation results show that the contrast of the original image and the edge detail information can be greatly enhanced by using this algorithm.Image enhancement effect of the algorithm is better than that of the PE algorithm and CLAHE algorithm.