[Lay more stress on the study and application of covering materials for wounds].

Skin is the largest organ in human body. It guards the underlying muscles, bones, ligaments, and internal organs. The skin faces the environment, and it is the first line to defend against the assaults of external physical, chemical, and micro-organic factors. The other functions of skin include systemic metabolism, temperature regulation, sensation, and production of vitamin D and folate. Skin injury usually leads to barrier function damage. Extensive skin injury would induce a series of problems such as water-electrolyte disorder, hypoproteinemia, and severe infection. Thus it is important to choose a suitable wound dressing when the skin is severely injured. The characteristics of wound dressings have undergone repeated and noticeable changes over the last several years. Compared with that of the traditional dressing, the ability of new dressings is improved obviously in the properties of wound protection, infection prevention, and wound healing promotion. This article deals with an overview on the characteristics of different wound dressings.