Abstract: Objective: To investigate the diagnosis and treatment of left colon carcinoma with obstrution in elderly patient. Methods: Thirty-eight cases of colon carcinoma were retrospectively analyzed. Twenty-nine cases received radical resection and one-stage anastomosis,7 cases were undergone Hartmann operation,2 cases received bypass operation. Results: Thirty-seven cases were cured (among them,2 cases with developed anastomosis leakage received second-operation and healed),1 case with developed anastomosis leakage and died. Conclusions: One-stage anastomosisis is safe and feasible for elderly patient who had colon cancer with obstruction, under the condition of strict perioperative treatment and enough lavage.