In hazy weather condition, images of outdoor scene are greatly affected by light scattering. Due to the fog, image parameter estimation of sunlight and skylight becomes more complex. In accordance with the atmospheric scattering model, this paper formulates the basis image model of outdoor scene, and presents the algorithm of parameter estimation of haze image. By iterating the scattering coefficient, the algorithm produces the proper haze density and depth of the haze image. It then decomposes the haze-free image to obtain the right illumination coefficient, best haze-free image and combined image. Experimental results demonstrate the effectiveness of the proposed approach in finding the proper hazy density and the corrected depth image of the scene.