２０例连续收治的直肠癌患者（男１３例，女７例）在行腹会阴联合切除术前和术后１３ｄ及６个月分别进行了尿动力学检查。尿动力学研究包括尿流率、膀胱压力图、尿道压力图及Ｌａｐｉｄ试验。结果发现尽管手术后排尿障碍很常见，但大多数都是暂时的。重要的是应注意区别暂时性和持久性排尿障碍。手术后期才出现的排尿障碍，提示有肿瘤复发的可能。尿动力学检查对于直肠癌根治术后排尿障碍的诊断和治疗都有很重要的意义。 Twenty consecutive patients with rectal cancer (13 males and 7 females) underwent urodynamic examination before and after abdominal perineal resection and at 13 and 6 months after operation. Urodynamic studies included urinary flow rates, bladder pressure maps, urethral pressure maps, and Lapid tests. It was found that although urination disorders are common after surgery, most of them are temporary. It is important to note the difference between temporary and persistent voiding disorders. The urination disorder that occurred only late in the surgery suggests a possible recurrence of the tumor. Urodynamic examination is very important for the diagnosis and treatment of urination disorders after radical resection of rectal cancer.