In case of acute obstruction secondary to colorectal carcinoma, emergent surgical intervention is needed and many types of operation including staged operation, subtotal colectomy and intraoperative colonic lavage have been tried. But those operations are not elective and have high morbidity and mortality. By the use of the Flexible covered stent, we resolved obstruction in 4 cases of colorectal carcinoma and prepared the bowel mechanically by polyethylene glycol. After improvement of the general state of the patients and assessment of the extent of the disease, we performed elective and single stage operation in all cases and had no complications associated with the stent. The treatment with the Flexible covered stent is a safe and effective procedure for malignant colorectal obstruction that makes it possible to perform a single stage operation.