I. Clinical manifestations Mainly abnormal urination. The symptoms can be divided into two categories: obstruction and irritation; obstruction symptoms are waiting for urination, interruption, terminal dripping, thin and weak urine line, incomplete urination, etc. Irritation symptoms are frequent urination, nocturia, urgency and painful urination. Symptoms can be aggravated by cold, alcohol consumption and the application of anticholinergic and psychiatric drugs. Long-term obstruction may lead to hydronephrosis or even renal dysfunction, and serious uremia may occur. Examination Ultrasound can confirm the diagnosis. Treatment (a) emergency treatment to place the ureter, can not be placed with suprapubic cystostomy. (b) Non-surgical treatment classical drugs: tamsulosin hydrochloride, finasteride. All other are adjuvant drugs and can be applied optionally. (iii) Surgical treatment ① suprapubic prostatectomy (now rarely used) ② retropubic prostatectomy (now rarely used) ③ transepithelial prostate removal (now rarely used) ④ transurethral resection of the prostate with its advantages of less trauma, less bleeding, faster recovery, relatively low surgical risk and to some extent controllable, the procedure is rapidly popularizing and maturing, and is now the The “gold standard”.