Allergens are divided into inhaled and ingested allergens, and inhaled allergens are divided into indoor and outdoor allergens. Outdoor allergens, such as pollen, are difficult to control, while indoor allergens can be reduced through our own efforts. Indoor allergens of allergic rhinitis in children are mainly mites in the southern region. Mites are small, eight-legged insects invisible to the naked eye and only 0.1 to 0.5mm in size. The mite’s live body, excrement and dander after death can cause allergy in children, and it likes warm and humid environment, with temperature at 20-30℃ and humidity at 70-80% as its suitable living environment. A pillow that has been used for six years is said to have mites and their corpses on it, which can account for 10% of the weight of the pillow. Removal of indoor allergens is mainly to remove mites. The methods are as follows: 1. Humidity: keep indoor humidity at 40-50%, you can use the air conditioning dehumidification function; 2. Bed hygiene: try not to use down silk products, use mite proof bedspreads and wash them with water above 55°C every 1-2 weeks; put the bedding in a black plastic bag after exposure to the sun and take it out to knock. Carpets, curtains, toys, accessories: try to reduce such items, such as using as much as possible with plastic-type products, do not use down silk class indoor vacuuming, insecticide kill cockroaches and other possible sources of variables, as far as possible to get rid of dust, mites; 3, pets: try not to keep poultry, dogs and cats with fur pets; 4, do not store old newspapers and magazines at home, often clean bookcases, display cabinets, lockers, clean the filter of air conditioners; 5, open the windows and ventilate as often as possible 5, often open the windows and ventilation, keep the room dry.