The invention discloses a method for the transforming of a 2D image into a 3D image. The method comprises the steps of: (a) selecting an object of 2D image; (b) setting a base line in the 2D image; (c) base on the base line, judging whether the object is located on the foreground or background of the 2D image; (d) offering a displacement to the object; (e) moving the object with the displacement to generate a plurality of continuous images; and (f) sequentially outputting each of the continuous images to generate the 3D image. Accordingly, after the user selects an object of 2D image, the method of the invention will automatically transform the 2D image into the 3D image.