The low-intensity light of the semiconductor laser therapy instrument produces stimulation, activation and photochemical effects on tissues, which can improve tissue blood circulation, inhibit the excitability of the sensory nervous system, promote the growth of new blood vessels and the proliferation of granulation tissue, thus playing the role of anti-inflammation, pain relief and promoting the repair of various tissues. It can be used in the treatment of soft tissue injury, poor wound healing, burns and scalds, phlebitis, facial neuritis, herpes zoster, etc.