The role of eosinophils is anti-allergy, phagocytosis of bacteria and parasites. 1. Anti-allergy: eosinophils are a kind of white blood cells, which are very important cells in allergic reactions. When the human body has allergic reactions such as skin allergies, allergic rhinitis, allergic asthma, eosinophils generally increase in the phenomenon of eosinophils, which is a manifestation of the eosinophils’ anti-allergy and protection of the human body. 2. Phagocytosis of bacteria and parasites: eosinophils have many eosinophilic particles, which will phagocytose invasive bacteria, parasites and other non-organic foreign bodies in the body, if there is a bacterial or parasitic infections, the phenomenon of increased eosinophils, need to do the appropriate treatment, such as to be albendazole anti-parasitic infections. If the phenomenon of increased eosinophils, it is necessary to promptly identify the causes, understand the patient’s daily diet and living environment, if necessary, blood and histological examination to clarify the cause of the disease, timely treatment under the guidance of physicians.