Only aiming at the paper fragment models based on the longitudinal cut method or the crisscrossed cut method, according to the matching degree of the pixels on the edge of the graphics, this paper proposed an efficient fragments reassembling algorithm, which solves the problem of regular fragments reassembling by crisscrossed cut. In the aspect of error regulation, a way of using the computeraid manual work instead of the only manual adjustment and the auxiliary algorithm are proposed. Meanwhile, the corresponding algorithm for the regular fragments reassembling resulting from noncrisscrossed cut is theoretically put forward as well.