1, massage function. That is, ultrasound can exert certain pressure on human cells to make them move slightly, thus changing the state of diseased cells and achieving the purpose of treating diseases;

2. Thermal action. That is, after the human body absorbs the energy of ultrasonic waves, the blood circulation of the skin is accelerated, and a fever reaction can occur in the tissue. The generated heat has the functions of relieving pain, relieving muscle spasm and improving tissue microcirculation.

3. Biological function. That is, ultrasound can affect some chemical or biological changes in the human body and change the activity of enzymes, thus changing the metabolic environment and state in the human body and transforming diseases in a good direction.

4, the role of the nervous system. The nervous system is sensitive to ultrasound. Low-dose ultrasound can inhibit nerves and slow down the conduction speed of nerves, thus having obvious analgesic effect.

5. Other functions. Ultrasound can increase gastrointestinal peristalsis and gastrointestinal secretion; It can dilate the coronary artery of the heart and improve the blood supply to the myocardium; It can dilate the blood vessels of the kidney and increase the blood flow of the kidney.