Can improve microcirculation. During fumigation, skin temperature will rise, skin capillaries will expand, blood circulation will increase, metabolism of skin and body will be promoted, and joint swelling will subside and tissue regeneration will be promoted. It can eliminate fatigue, give people comfort, reduce the excitability of skin peripheral nerves, relieve skin tension, muscle spasm and stiffness, and thus relieve joint pain; Sweating and relieving exterior syndrome, regulating qi and blood, eliminating dampness and dispelling cold, killing insects and relieving itching, etc. , can be widely used in the treatment of various systemic diseases, and has good curative effect;