The methods to evaluate image quality based on the radial fuzzy degree function and structural information of images respectively to evaluate the degradation degree of radiant blurred images result in the high speed forward motion between the camera and the target, are studied. The conclusion that it is unstable to describe the fuzzy degree of images with different prospect quantitatively by radial fuzzy degree function, is got. According to imaging mechanism of radiant blurred images and human visual characteristics. The method based on structural information of images put forward, which can evaluate restored images’ quality of radiant blurred images,without the clear image; Using it, when the normalized iterative method is used to restore radiant blurred images, its excellent fault tolerance ability and good feasibility in practical engineering application are exhibited.