90% of middle-aged and elderly people have leg and foot problems, such as rheumatism, rheumatoid arthritis, cold legs, joint bone pain, varicose veins and so on. Most of these problems are caused by perennial exposure to wind and cold, blockage of meridians in the body, and qi and blood stagnation. The far infrared foot bath bucket collides with molecules in the human body through spectral irradiation to generate heat, and the * * * vibration principle increases the kinetic energy of molecules to a greater extent, which will make the heating effect more obvious and in-depth. In addition, because the human body continuously emits far infrared rays, it can also directly absorb the far infrared energy in this frequency band within this frequency range, and at the same time directly supplement the biological energy of human tissues and organs, so that people's healthy qi (Yang Qi) is increased and cold pathogens are reduced. It can activate cells, promote blood circulation, dispel body cold, accelerate metabolism and improve human immunity.