1. A method for identifying calcification portions in a dual energy CT contrast agent enhanced scanning image, wherein the method comprises the steps of: filtering the pixels in the dual energy CT contrast agent enhanced scanning image to acquire pixels to be grouped; grouping the pixels to be grouped in a plurality of pixel groups according to the positions of the pixels to be grouped in the dual energy CT contrast agent enhanced scanning image; material-decomposing the pixels in each pixel group; and determining the pixels corresponding to the calcification portions in the plurality of pixel groups according to the result of the material-decomposing.