To summarize clinical experience in stage differentiation and treatment of pediatric bronchial asthma from the prospective of the struggling between healthy

qi

and pathogenic

qi

. The bronchial asthma in children could be divided into the attack stage， the prolonged stage， and the remission stage. It is believed that the attack stage showed exuberance of healthy

qi

and excess of pathogenic

qi

， with the pathogenesis mainly being external pathogens constraint in

wei

level， phlegm-rheum obstruction in lung， so the treatment should diffuse the lung and dispel pathogen， clear up phlegm and dissolve rheum， prescribing with self-prescribed

Quxie Ximing Decoction

（祛邪息鸣汤）； the prolonged stage showed deficiency of healthy

qi

and retention of pathogenic

qi

， with the pathogenesis mainly being deficiency of both lungs and kidneys， and phlegm-stasis obstruction in collaterals， so the treatment should warm the kidney to improve lung reception， resolve phlegm and clear up phlegm， prescribing with self-prescribed

Wenshen Naifei Decoction

（温肾纳肺饮）； the remission stage showed weak healthy

qi

and pathogenic

qi

， with the pathogenesis mainly being lung-spleen

qi

deficiency and mild pathogens retention， so the treatment should fortify the spleen and supplement the lung， reinforce healthy

qi

and dispel pathogen， prescribing with self-prescr

ibed

Peitu Gujin Decoction

（培土固金汤）.