A high volume of residual urine that cannot be recovered on its own must be sought by a urologist. If there is no obstruction in the lower urinary tract, i.e. the urethra is not obstructed, you can use bladder contraction medication to improve the contraction ability of the bladder forceps muscle, to see if it can alleviate the difficulty in urination and reduce the amount of residual urine. If there is obstruction of the urethra, such as prostate enlargement that causes difficulty in urination, bladder contracting drugs cannot be used, and the obstruction should be relieved by medication for the prostate or prostate surgery. Some patients with urethral stenosis, resulting in high urethral resistance and increased residual urine volume, should seek urological specialists to perform urethral dilatation surgery to solve the problem of residual urine volume.