In a sense, prevention of asthma is even more important than treatment. Some patients have clear allergens and excitatory factors that should be avoided as much as possible, and those with obvious seasonal and temporal regularity should be given preventive medication. And the relationship between allergic rhinitis and asthma should be emphasized. Special reminder, bronchial asthma patients in ordinary life should do: 1, the living room diligently clean, to avoid the accumulation of dust and dust mite breeding, but pay attention to wear a mask when cleaning the room, wipe with a wet cloth; 2, indoor furnishings simple, no carpets, no feather pillows, no pets and planting flowering plants; 3, to avoid tobacco smoke, odor, dust and other dirty air, quit smoking and avoid the hazards of passive smoking; 4. Avoid strenuous exercise, should do regular and gradual exercise; 5, avoid emotional excitement; 6, weather changes require special protection, active prevention and control of upper respiratory tract infections.