The main thing is to avoid contact with allergens (1) Stay away from allergens – pollen Tree pollen: starts in mid-March and reaches its peak from April to June, the main allergenic pollen is elm, poplar, willow, etc.; grass pollen starts in late July and reaches its peak from August to September, the main allergenic pollen is Artemisia, Gramineae, etc. After identifying allergens, try to reduce outdoor activities in the meantime, wear glasses and masks when possible if unavoidable, and shower promptly after going home. If you are indoors, close the windows and use air conditioners with air cleaning and filtering functions. (2) Keep away from allergens – dust mites Spring and autumn are the two peak densities of dust mite populations, with higher densities in autumn than in spring. Air-conditioned rooms can reproduce year-round, and bedroom bedding and carpets are the most suitable breeding grounds for dust mites. To reduce the breeding of dust mites, first of all, the bedroom should be kept clean and dust-free, well-lit, with windows frequently opened to keep the air fresh and avoid humidity, and secondly, flooring materials should be easy to clean, such as wood and stone, without carpets. Cleaning and disinfection of bedding: bedding, pillows, clothes, curtains and other diligent washing and sunbathing; bed bedding, etc., the dust, dander and mites will be exposed to the sun and beat out; about 10 days with 55 ℃ hot water scalding, 100 ℃ hot water can make allergenic protein denaturation, the effect is better. (3) away from allergens – mold control of indoor mold and mildew: first of all, keep the room dry, ventilated to avoid long-term darkness and humidity, clothing mold as soon as possible to throw away, food reasonable preservation, to prevent mold. If mold is found immediately disinfected with bleach.