Urethral dilation is a modality often used in clinical practice to treat urethral strictures, usually with a urethral probe. Urethral probes consist of metal probing rods of varying diameters, usually starting gradually from a small size to expand to a large size to a normal urethral outlet. Urethral dilation usually serves two purposes: first, to increase the width of the urethra by mechanical dilation. Second, by massaging the mucosa of the urethra through urethral dilation, thus improving local blood circulation and softening the scarring around the urethra, thus achieving a permanent treatment effect. Urethral dilatation usually requires a gradual increase in the coarseness of the urethral dilatation starting from a small size, and is usually used to treat urethral strictures caused by urethral inflammation, formation of urethral strictures after urethral trauma, or after urethral instrumentation, and is usually indicated for urethral strictures with a relatively short urethral stricture segment.