In this paper we proposes a new method for comparing the quality of defogged images based on the halo artifacts，the color shift，and other issues which often appear during the defogging process.the canny edge detector is used to denote the detail performance of defogged images，is utilized to denote the color performance of defogged images，the is used.We use the structural information of the reflection image to indicate the structural performance of the defogged images.Using all these three factors，the effect of defogging methods can be evaluated objectively.Experimental results show that the proposed method，which is based on the visual differences of images before and after defogging，can compare the effect of different defogging methods and is consistent with the subjective perception.