An image jointing method includes steps of obtaining a first image, a second image including a line image, and a displacement data, dividing a specific region of the line image as image blocks and calculating to obtain feature values corresponded to the image blocks, comparing the feature values and utilizing an initial coordinate of the image block corresponding to the maximum of the feature values as a feature point representing the line image, corresponding the feature point to a base point of the first image according to the displacement data and obtaining a first jointing point corresponding to the first image and a second jointing point corresponding to the second image according to the base point and the feature point, and jointing the first image and the second image through the first jointing point and the second jointing point, thereby significantly reducing the operation time and enhancing the user experiences.