A high capacity reversible watermarking algorithm for JPEG images is proposed. The al gorithm determines the embedding positions with the zero coefficients intervals of DCT coefficients in JPEG images. The embedding capacity is calculated based o n the zero values number in each interval. Moreover, it brings no additional information, e.g. the locatio n map. According to the zero coefficients intervals, watermark information can be extracted accurately, and the original image can be recovered losslessly. Exp erimental results show that the algorithm can obtain the watermarked images wit h high perceptual quality and high capacity, and the increment of image file siz e is smaller than other reversible watermarking schemes for JPEG images.