Based on the defects of single noises analysis or blur analysis in image quality evaluation, combined with telescope extended imaging characteristics, an image quality evaluation method under contrast and Structural similarity was designed and proposed, the basic principle, the specific implementation process as well as mathematical models of this method was given. The simulation image and measured image were used to validate the proposed method, validation results show that: the proposed evaluation method can give an effective evaluation value on sequence defocused image, noise image, defocused and noising image, the evaluation results close to human visual characteristics. The method can evaluate the image affected by noise and blur simultaneously effectively, and can give effective quantitative evaluation value. The evaluation results have high accuracy, monotony and consistency.