In order to better eliminate the targeted haze in image, an improved haze removal algorithm aiming to solve the shortage of original dark channel prior is proposed. First, the self-adaptive boundary is used to obtain the dark channel region block, and the interval of the atmospheric light intensity is estimated. Then, the transmittance repair method is improved. By including fault tolerance method, the improved algorithm can conveniently deal with the bright area which the original algorithm did not handle. The experimental results show that the improved algorithm can effectively remove the haze and bright area of the image.