Scraping the scrotum, first wipe it with 2% iodine tincture cotton ball, then wipe it with 75% alcohol cotton ball to remove iodine, then fix a testis with the thumb and forefinger of the left hand, tighten the scrotum skin, cut the scrotum and the common tunica vaginalis 1-2cm at a time along the longitudinal axis of the testis, squeeze out the testis, and cut off the scrotum ligament. Please refer to.