Laser directly irradiates on the lesion part which blood flow is decreased or irradiates the sympathetic ganglion which dominates this range. It could supply sufficient blood and nutrition in order to improve the metabolism and relieve symptom.

Laser irradiates the lesion area to enhance the activity of phagocyte and improve immunity and inflammation quickly.

The injured part could release the substance similar with morphine after laser irradiation. Laser irradiation also could reduce the conduction rate, power and impulse frequency to relieve the pain quickly.

Laser irradiation can accelerate the growth of new blood vessel and granulation tissue and improve protein-synthesis. Blood capillary is one of the basic elements of granulation tissue, which is the precondition of wound healing. Organizing much more oxygen supply to damaged tissue cells and accelerates the production of collagen fibers, deposition and cross-linking.