Ultra-long electromagnetic waves are a kind of low-frequency electromagnetic waves, similar to solar magnetic waves. Its essence is a low-frequency alternating magnetic field. The intensity and direction of the electric and magnetic field change with time, the vibration frequency is between 50-60 Hz, and the wavelength is 5.0×106～6.0×106m. Because its physical properties are similar to solar magnetic waves, when used in the human body, it can significantly improve blood circulation, improve immunity, regulate nerve and endocrine functions, and produce good health care, treatment, and rehabilitation.