In order to evaluate the performance of laser jamming objectively, precisely and quantitatively, the definition of image edge strength and its computation method are provided, and an objective image metrics based on the edge strength similarity was proposed. The metrics evaluate the laser jamming performance by computing the similarity between the target image and laser jamming image. The higher the similarity between target and background is, the better the laser interference performance is. Experimental results of laser interference in and out the field of view show that the proposed metrics could realize quantitative appraisal of laser jamming performance on CCD imaging detection system and have a better consistency with the eye′s experimental data in the prediction of detection probability than common clutter metrics by taking use of the Search_2 dataset.