Patients undergo R0-R1 resection and receive adjuvant chemotherapy oxaliplatin with fluorouracil (5FU) and folinic acid（FOLFOX）or oxaliplatin with oxaliplatin with capecitabine(capox) for no less than 4 months. Radiotherapy may be applied for patients with rectal cancer if clinicians suspect that is necessary. Then patients receive oral capecitabine for 12 months maintenance.