Environmental factors play an important role in asthma attacks. The influence of children on factors such as mites in the home and passive smoking appears to be more prominent. Dust mite control is part of the overall treatment of allergic diseases. Patients with perennial allergic rhinitis, asthma or atopic dermatitis who are allergic to mites must be treated by inhalation therapy and specific desensitization along with control of house mite allergens. The main dust mites that cause asthma are house dust mites and dust mites. House dust mites feed on human or animal dander and reproduce more rapidly on beds and in bedroom carpets. Dust mites feed on a variety of grain dusts. Dust mites go through five stages in their life cycle: egg, larva, first wakame, third wakame, and adult. 60% of the time they are in the relatively quiescent stage of the first wakame. When conditions such as temperature and humidity are favorable, it takes about 3 weeks to develop from egg to adult. Male dust mites live for 2 to 3 months and female dust mites live for 3 to 5 months. Adult dust mites can reproduce sexually once they become adults. Female mites can lay more than 100 eggs in their lifetime. In northern China, the breeding season of house dust mites is mainly from June to October; in many areas in southern China, dust mites can reproduce year-round. The most suitable conditions for the survival of dust mites are: temperature 17-30°C and relative humidity 75%-80%. The conditions for dust mites to die are: temperature greater than 35℃, or less than 0℃ for 24 hours, humidity less than 50% or greater than 85%, then they cannot reproduce. According to the conditions and food sources of dust mites, the prevention of dust mites can follow two principles: 1) change the temperature and humidity of the environment; 2) cut off their food sources. Dust mite allergy sufferers can use the following effective methods to control the survival and growth of dust mites according to the specific environment they live and work in. (1) Reduce indoor relative humidity: It is easier to control humidity than temperature. Keeping relative humidity below 50% is the most common method to control the level of mites and their allergens. With relative humidity continuously under 40% to 50%, adult mites will die within 5 to 11 days due to dehydration even when the temperature is 25 to 34°C. High-performance dehumidifiers or air conditioners can be used indoors to reduce relative humidity, and frequent cleaning or replacement of air conditioner dust collector covers or nets to reduce dust mite breeding. (2) Use special anti-mite materials for packing mattresses and pillows: The ideal packing materials should be comfortable, breathable fabrics that can permeate vapor and stop mites and mite allergens from passing through. The pore size of the fabric is very important when purchasing pillow and mattress packaging materials. The width of young mites is generally greater than 50 microns, and fabric less than or equal to 20 microns can stop all mites from passing through. High-quality down pillows, down quilts, down clothing due to its surface covered with fabric is very dense, can block the body’s dander, stopping dust mites from entering and dust mites multiplying inside. (3) Washing, drying and dry cleaning of bedding: seat covers, pillowcases, blankets, mattress covers, etc. are washed at least once every 3 weeks with hot water equal to or higher than 55°C to kill mites and remove most mite allergens. The vast majority of mite allergens are water-soluble and can be removed by washing with warm or cold water, but the vast majority of mites cannot be killed. Dryer dry clothes to be greater than 55 ℃, more than 10 minutes can kill all the mites. (4) Carpets, curtains and home soft decorations should be replaced and cleaned diligently: these items accumulate debris debris and stay damp, providing an ideal habitat for mites to breed. Carpets should not be used in humid areas, and window (fabric) curtains or blackout shades should be replaced with blinds. Home décor fabrics should be replaced with vinyl or leather cushions, and furniture should be made of wood. Carpets should be vacuumed once a week and vacuum cleaner bags should be replaced frequently. Routine vacuuming removes mites and allergens from the surface, but does not significantly reduce the number of live mites or remove deeply embedded allergens. Never use steam to clean the carpet, which will leave residual moisture and instead promote mite growth. (5) Air cleaning and filtration: The main component of room dust is mites. Mite allergens are mainly attached to dust particles larger than 20μm in diameter. Air flow makes them airborne particles, which cause allergies after inhalation. Air cleaning or filtration must let the room air flow and let the dust float up, which can play the role of cleaning or filtration. (6) Freezing soft toys and small items: Freezing soft toys and small items (such as pillows and special clothing) at -17℃ to -20℃ for at least 24 hours can effectively kill the dust mites on these items. In northern areas, leaving mattresses and pillows outside for 24 hours in the cold winter months can also kill mites. (7) Do not keep cats, dogs and other pets indoors: the bodies of small animals have the right temperature and humidity, and the large amount of dander is also a rich food source for dust mites, which breed on their bodies and can be carried to all corners of the house and spread everywhere. (8) Chemical reagents: The main chemical reagents in use are: benzyl benzoate, disodium octaborate tetrahydrate, thorium reagent, paracetamol and denaturant, etc. However, the effect of removing mites and their allergens is not very satisfactory, and their active ingredients must be delivered directly to the place where mites live to be effective. And the indoor safety of these acaricides needs to be confirmed by further studies, and repeated applications can lead to the emergence of drug-resistant mites.