irstly, Wound therapy was wound healing in principle , and reduce the interference factors simultaneously. Disposable vacuum continuous drainage system is used to create a condition without postoperative complications. It can fully drain secretion in the wound, and make the wound tightly closed in continuous and stable pressure of -40 ~ -50 kpa, and effectively prevent excessive drainage caused by high negative pressure, achieve continuous and stable internal function. It can prevent forming potential bacteria culture medium in the wound, reduce wound infections and minimize the use of costly antibiotics.