An algorithm based on non-local prior is proposed for the identification of large targets such as the distribution of enemy radar stations, the location of caverns and depots, and transportation supply line in mountainous areas.Firstly, the color index is used in the mountain haze image to obtain the haze line for cluster detection, and then the initial value of the transmission coefficient of pixels in the haze line is estimated.Finally, the transmission coefficient is regularized by the optimized algorithm, and finally the haze-free image is obtained.