Chronic skin wounds do not heal, although not life-threatening, but the long period of time to bring great inconvenience and pain to the patient’s life, physical factor therapy (physiotherapy) can often play a significant therapeutic role. Physical therapy treatment of difficult-to-heal skin wounds from the second world war, according to the former Soviet Union on the second world war casualties physical therapy effect of summary report: soft tissue wounds physical therapy cure rate of 93.9%; first by the physical therapy of wounds, postoperative healing average of 36d, while the wounds of the non-physical therapy is 52d; by the physical therapy of wounds surgical complications significantly reduced; open femur fracture early application of ultraviolet light irradiation of wounds, only 11.5% complication of the wound. Only 11.5% of open femur fracture wounds were complicated by firearm osteomyelitis, while 70% of wounds without UV irradiation were complicated by osteomyelitis. The therapeutic mechanism of physical therapy lies in the fact that physical factors or physical field can not only reduce pain and improve blood circulation and metabolism of the tissues, but also make the tissues change at the cellular and molecular levels, for example, the changes of trace elements in the tissues, and the transformation of various biologically active substances into free radicals and significantly affecting their activity; changes in the structure of the membrane proteins of the cells and cellular organelles and the changes in the electric charge of the surface of the membranes, resulting in changes of the intracellular level of cAMP ( Changes in membrane protein structure of cells and organelles, changes in membrane surface charge, resulting in changes in intracellular cAMP levels (signaling system) and membrane permeability; at the same time, intracellular resonance or bioresonance of tissues occurs under the action of physical factors, resulting in structural and functional changes, as well as morphological changes in tissues and specific reactions of the body, and so on. Human skin has a variety of forms and functions of the cell layer, a variety of physical factors on the skin function is also a variety of influences, some anti-inflammatory, some to reduce swelling, some can increase phagocytosis activity, some can inhibit the proliferation of fibrous connective tissue, some can make the tissue loosening and thinning of the skin, and so on, the appropriate and reasonable application of the body can be initiated by the body’s intrinsic repair mechanism, so that the skin’s pathology recovery for the normal.