Asthma in children is caused by the disorder of

qi

movement， and can be treated by regulating lung

qi

. It is believed that the contention between phlegm and

qi

is the main pathogenesis of children with asthma of attack stage， and the ascending counterflow and congestion of lung

qi

are the key points， for which the main treatment method is to direct

qi

downward. When the ascending counterflow of lung

qi

is resolved， the ascending and descending of lung

qi

will be restored， and the congestion of

qi

movement will be rectified， thereby clearing the latent phlegm naturally， and achieving the purpose of relieving the symptoms of wheezing and asthma， and calming the phenomenon of airway constraction. When using Chinese medicinals for directing

qi

downward， attention should be paid to the correspondence between diffusion and descent， the mutual assistant between dissipation and astringing， and the focus on harmony. When external pathogen invades the lung， and the airway is disturbed， it is necessary to differentiate cold from heat. For diaphragm fullness of phlegm，

qi

movement is congested， and therefore phlegm and

qi

should be treated simultaneously. In terms of diseases caused by the emotions， the cardinal is disturbed， and it is suitable to regulate the lung and the liver simultaneously.