objective:to investigate the therapeutic effect and post－operative complications of modified ileal orthotopic neobladder after radical cystectomy. Methods:radical cystectomy and ileal neobladder were applied in 21 male patients with improved surgical method. Results:twenty－one cases of ileal neobladders have been followed up for 1 to 4 years with a mean of 2.1 years. The operation was taken 5.5 to 7.5 hours with a mean of 5.9 hours. The intraoperative blood transfusion was 150 ml to 1 200 ml with a mean of 450 ml. All patients achieved excellent follow－up. The mean bladder capacity of the entire group was 330 ml,and residual urine volume was less than 80 ml. No patient suffered for electrolytical disturbance and urethral tumour recurrence. Conclusion:the modified radical cystectomy and ileal neobledder was a perfect surgery artifice.