Current typical calculation methods of image color difference can not correctly reflect the true observing effect. An image evaluation method based on hue angle algorithm was introduced, which weighted every pixel on different scale in the image and then calculating the color difference of whole image. Experiment was carried out for comparison with traditional color difference calculation methods. The results showed that the method is effective and universal. This paper studied an image evaluation method which weighting every pixel on different scale in the image and then calculating the whole image color difference. This method control the result based on the color hue and the result is tested effectively and acceptably by experiment.