Skin preparation is the operation of shaving the relevant area and cleaning the surface of the organism before the surgical operation, and sometimes preoperative skin iodine-vapor cleansing is done to remove bacteria from the surgical incision and the surrounding skin in order to prevent wound infection. It needs to be performed by a healthcare professional to perform the specific operation. This is done by first washing the skin with warm soapy water and shaving the hair with a razor. Care is taken to avoid damaging the skin, and then the skin is washed with warm water to remove dirt and oil. Generally choose the day before the operation to prepare the skin operation, in the operation of the action should be gentle, shaving hair when shaving with the hair. Extremity surgery needs to remove the finger gap, abdominal surgery to remove the navel of dirt and grease. Hand and foot surgery to cut the nails and remove calluses, anorectal surgery to carry out perianal skin preparation, surgical skin preparation should be larger than the surgical incision around each of the more than 15 centimeters.