The flocculent material attached to the bladder in postoperative examination of bladder cancer may be due to traumatic scar tissue, recurrence of bladder cancer and other reasons. 1. Traumatic scar tissue: flocculent material attached to the bladder in postoperative examination of bladder cancer should be seen when reviewing cystoscopy or b-ultrasound after cystectomy for bladder cancer. Generally speaking, it should be traumatic scar tissue when rechecked for a short period of time after surgery. It will be epithelialized and repaired after a period of time. 2. Recurrence of bladder cancer: if there is still flocculent material attached to the bladder after a long period of time after surgery, tumor recurrence cannot be excluded. Cystoscopy + biopsy is feasible. Postoperative cystoscopy of bladder cancer with flocculent material on the bladder may be caused by many kinds of diseases, and patients should consult doctor in time to find out the specific causes of the disease and follow doctor’s instructions.