Colorectal cancer has been the third most seen malignant tumor in our country, whose mobility is tend to become higher than it was before by years. The prognosis of patients suffered from colorectal cancer is much better than gastric cancer, lung cancer and liver cancer. The main factor related with the therapeutic effects is the stage of patient and the 5-year survival rate is more than 90% for Dukes A but only 30% for Dukes C with the main death reason being regional lymphoid node or remote met...