The autonomic nervous system is a control system that does not depend on the person’s subjective will and operates according to its own laws, regulating the most basic physiological activities to ensure human survival, such as regulating heart rate, blood pressure, digestion, respiratory rhythm, pupil reflex, food digestion, sexual impulses and urination. However, the functional activity of the cerebral cortex also indirectly affects the function of the autonomic nervous system, such as heart rate, breathing acceleration, pupil dilation, etc. when excited. If the brain is disturbed in thinking, anxiety and depression, it can even cause disorders of autonomic nerve function. In the human body, the autonomic nervous system includes the sympathetic nervous system and the parasympathetic nervous system. Under normal conditions, these two systems, which have opposite functions, are in balance with each other, so that when one side plays a positive role, the other side plays a negative role, and the physiological activities of the body are well coordinated and controlled within a reasonable range.