The skin soft tissue expander is generally composed of three parts, including expansion naan, injection jug, He a connecting catheter. Made of silicone rubber, the procedure is usually performed in two stages, the first stage is first buried under the skin or muscle, and water is injected into the dilating jug periodically, usually twice a week, for about one to two months, so that the skin and subcutaneous tissue on its surface gradually expands to the additional skin and subcutaneous tissue obtained. In the second stage, the dilator is removed and the scar is repaired with the extra skin and subcutaneous tissue. With a soft tissue expander of the skin, it does not cause scarring and deformity in the donor area, and the texture and color of the repaired tissue is close to the surrounding tissue.