Comparison of Fast-Track (FT) and traditional management protocols. the primary endpoints is length of hospitalization post-operation (d, mean±SD). It was calculated by the difference between date of discharge and date of surgery. The secondary endpoints are complications in both groups are assessed during the first 21 days postoperatively. Including infection(wound infection, lung infection, intraperitoneal infection, operation space infection), postoperative nausea and vomiting (PONV) , ileus, postoperative hemorrhage, postoperative thrombosis and APACHE II score.