我们对５０例前列腺增生的病人经直肠超声检查，同时动态观察排尿时，尿道扩张情况。在前列腺增生时，内腺明显增大，致使内、外腺比例失调，并有增生结节形成。由于增生结节的挤压，尿道迂曲变长，扩张受限，扩张＞０．４ｃｍ者，无残余尿存在，≤０．４ｃｍ者，约半数以上可见残余尿。 We 50 cases of benign prostatic hyperplasia by transrectal ultrasound, while dynamic observation of voiding, urethral dilatation. Prostatic hyperplasia, the internal gland significantly increased, resulting in the imbalance of the inner and outer glands, and nodular hyperplasia. As the proliferation of nodules, urethral tortuous longer, limited expansion, expansion> 0.4cm were no residual urine, ≤ 0.4cm were about more than half of visible residual urine.