Allergens are broadly classified into three categories: infectious agents and their toxins; inhalants; food: mainly heterogeneous proteins, such as milk, eggs, fish and shrimp, spices, etc. 2, non-specific irritants such as dust, smoke (including cigarettes and mosquito incense), odors (industrial irritant gases, cooking oil smell and oil knee smell), etc.. 3, climate Children are sensitive to climate change, such as a sudden cold temperature or lower air pressure, can often stimulate asthma attacks, therefore, generally in the spring and autumn children’s morbidity increased significantly. 4, mental factors Asthmatic children are often affected by emotions, such as crying and laughing or anger and fear can cause asthma attacks. Some scholars have shown that when emotional or other mental activity disorders are often accompanied by vagal excitation. 5. Genetic factors Asthma is hereditary, and the prevalence of family and personal history of allergies, such as asthma, infantile eczema, urticaria, allergic rhinitis, etc., is higher in children than in the general population. 6, exercise Foreign reports about 90% of children with asthma, exercise can often stimulate asthma, also known as exercise asthma.