Using self-made special supporting tube, coloanal anastomosis was performed by intra-anal ligation for radical surgery in 48 patients with low rectal carcinoma. The anastomoses were completed without suturing, and the results were quite satisfactory. Follow-up after operation revealed that the bowel movement and the sphincteric function were excellent in all patients. The anal canal and the anal sphincter were all kept intact and abdominal colostomy was not required for decompression. Anastomosis without suturing, least trauma, and short operation time made blood transfusion unnecessary during the operation. This technique is actually derived from Park's operation, and is considered a promising procedure for coloanal anastomosis in the radical surgery for low rectal carcinoma.