Abstract: Cough variant asthma (CVA) is the most common cause of chronic cough in children in China.The incidence rate in children is 0.77% to 5.0%.In traditional Chinese medicine some people classify it as "cough",while in western medicine it is also called cough asthma,allergic asthma,etc.Guided by the theory of "Xuanfu-collateral",this paper expounds the correlation between the pathogenesis of CVA in children and Xuanfu-collateral from the three stages of CVA attack,remission and stabilization.The pathogenesis in attack period is characterized by the invasion of outside pathogenic factors,the depression of Xuanfu Qi,and the shortness of collaterals.The treatment is to dispel the wind and relieve symptoms,relieve lung and stop cough,and soothe the collaterals.In the remission stage,the pathogenesis is phlegm and blood stasis,Xuanfu stagnation,and blocked collaterals.The treatment is to invigorate spleen and dry dampness,treat phlegm and blood stasis together,and unblock Xuanfu and collaterals.The pathogenesis of stable stage is deficiency of lung,spleen and kidney,deficiency of Xuanfu and disharmony of collaterals.The treatment principle is to treat lung,spleen and kidney,strengthen the foundation,supplement deficiency and relax collaterals.The paper is aimed to explore the pathogenesis of different periods and put forward corresponding treatment principles,hoping to provide new ideas for clinical diagnosis and treatment.

Key words: Cough variant asthma, Xuanfu, Collaterals, Children