Understanding asthma allergens can be avoided in daily life and is an important adjunct to the treatment of asthma. Common inhaled allergens mainly include dust mites, pollen, animal secretions, mold, indoor dust, smoke, etc. 1, dust mites: dust mites live in a humid, warm environment, and feed on the dander shed by the human body, mainly in the bedroom beds, carpets or sofas. 2, pollen: there will be different pollen in various seasons, the diameter is generally around 30 to 50 microns, by human inhalation subject to easily induce allergic reactions, maple poplar, elm, cypress, willow, pine, acacia, artemisia, quinoa, dogwood, rye and other plant pollen can induce seasonal asthma. 3, animal secretions: the secretions of cats, dogs, rabbits, birds and other pets kept in the home, urine of rodents, cockroaches and houseflies and their feces and limb debris are also allergenic. 4, mold: mold and its branch spores are the main allergens that cause allergies, especially in dark, damp and poorly ventilated houses and mushroom cultivation sites are very easy to breed. 5, indoor dust: indoor dust contains human epithelial debris, animal fur and debris, dust mites and secretions, mold and metabolites, pollen, cotton fibers, plant fibers, food residues and other organic matter, can stimulate the respiratory tract to cause asthma. 6, smoke: industrial smoke, tobacco and wood burning smoke generated by the smoke, although not antigenic irritants, but can induce asthma or make the condition worse.