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On the basis of the energy distribution of eigen-images of an image, a new watermark attacking method is proposed. For most removal attacking methods, they regard watermark as noise and adopt denoising methods to remove watermark. However, when the energy of watermark is removed from a watermarked image, the energy of the original image is also removed at the same time. To solve this problem, we predict the watermark energy using just-noticeable-distortion (JND). Then remove watermark energy from watermarked image based on the characteristic of eigen-images. From the experiment results, the proposed method is a very effective watermark attacking method.