I. Advantages: 1. keep the wound moist, creating a low-oxygen, slightly acidic environment, accelerating wound healing 2. with self-soluble debridement, with the role of dissolving blood fibrinogen 3. absorb a small to medium amount of absorbed exudate 4. form a gel to protect exposed nerve endings, reduce pain, will not cause mechanical damage again Nantong University Hospital Stoma Wound Incontinence Care Clinic Yuan Baofang 5. waterproof and anti-bacterial insulation II. Disadvantages: 1, can not be used for wounds with more exudate 2, easy to damage the surrounding fragile skin when tearing off 3, can not be used for infected wounds 4, absorbing exudate after the dressing becomes milky white, with odor easily confused with infected wounds 5, not advocated for wounds with deep submersion and more exudate 6, opaque not advocated for wounds that require close observation