It has the functions of promoting human metabolism, improving human immunity, enhancing human muscle energy and regulating human functional balance. According to the research, negative ions can inhibit, alleviate and assist seven systems and nearly 30 diseases of human body, especially for human health care. Negative ions are called "air vitamins" in the medical field, and their main functions are as follows: \x0d\ 1, especially on the nervous system. It can enhance cerebral cortex function and brain activity, invigorate the spirit, improve work efficiency and improve sleep quality. Negative ions can also strengthen the oxidation process of brain tissue, so that brain tissue can get more oxygen. \x0d\2。 This is an effect on the cardiovascular system. According to scholars' observation, negative ions can obviously dilate blood vessels, relieve arterial vasospasm and achieve the purpose of lowering blood pressure. Negative ions are also beneficial to improve cardiac function and myocardial nutrition, and are beneficial to the rehabilitation of patients with hypertension and cardiovascular and cerebrovascular diseases. \x0d\3。 It's the effect on the blood system. Studies have confirmed that negative ions can slow down the blood coagulation velocity, prolong the coagulation time and increase the oxygen content in blood, which is beneficial to the transportation, absorption and utilization of blood oxygen. \x0d\4。 Negative ions have the most obvious effect on the respiratory system. This is because negative ions enter the human body through the respiratory tract and can improve people's vital capacity. After testing, inhaling negative air ions in the glass mask for 30 minutes can increase the amount of oxygen absorbed by the lungs by 2%, while the amount of carbon dioxide discharged can increase by 14.5%, so negative air ions can improve and increase lung function. \x0d\ In addition, negative air ions have sedative and hypnotic effects. If we inhale a proper amount of negative ions every day, it will be of great benefit to health: it will make people energetic, eliminate fatigue and burnout and improve work efficiency. Improve sleep and eliminate neurasthenia. Reduce the occurrence of diseases and prevent colds and respiratory diseases. Improve the symptoms of cardiovascular and cerebrovascular diseases. Preventing air-conditioning diseases under the action of negative ions can increase the excitability of bones, reduce the duration of exercise, and help athletes improve their performance, especially in some events that need quick response, such as sprinting and swimming.