Medical research shows that it is small particle size negative ions that have medical and health care effects on human body. Because only negative ions with small particle size can easily penetrate the blood-brain barrier of human body and exert their biological effects. Natural air negative ions, because of the high proportion of negative ions with small particle size, have created many longevity villages. Because of its high activity and long migration distance, small-particle negative ions form a negative ion bath environment over the longevity area. At present, many negative ion household appliances are not effective because it is difficult to produce ecological negative ions with small particle size by using traditional negative ion generation technology. It has general medical and health care effects on human body, only dust removal and dust reduction, and is generally used in the field of air purification.