Negative ion generator is a device that produces air anion, transferring AV voltage into AC high voltage through circuit processing, and to get a negative DC voltage by rectified and filtered. It connects the negative high voltage to the releasing tip of carbon element production. The tip of the DC high voltage generates high corona and releases a large number of electronic in a very high speed way. But the electronic can’t exist long in the air, and it will be reacted with the oxygen immediately to generate air ions. Anion is often used for purifying air, makes people feel happy .It can also increase the body 's antioxidant to reduce damage of the active oxygen on human body. The main function of negative ions are: generating oxygen, improving pulmonary function, promoting metabolism, enhancing disease resistance, improving sleep, sterilization, eliminating smoke, controlling dust and protection.