Abstract: In order to deal with the fog image more effectively,an improved method based on haze removal using dark channel prior is presented in this paper after analyzing its defects and shortcomings.First of all,the original image is converted into a standard image through standardization transformation,and then we improve speed by replacing the soft matting with guided filter to refine transmission map and adjust transmittance in bright region to avoid the distortion and halo phenomenon.The experiment results show that the improved algorithm in speed increased by 84.2% than the original algorithm,and refrained from distortion which caused by excessive processing in bright region,and enhanced processing effects on color single foggy images.