Professor LIN Lin considers that "wind evil" is the main cause of cough variant asthma. "Wind" also has the distinction of "external wind" and "internal wind", and the two kinds of "wind" have their own characteristics. The external wind is the main factor and the internal wind is the potential factor. The external wind is prone to both cold and evil and the internal wind is accompanied by stagnation of Qi. Wind evil represses the lung to produce phlegm for a long time. Fengsheng Luanji is the core pathogenesis of the disease during the attack period. "Deficiency of lung and kidney yang" is the basic cause of recurrent attack of cough variant asthma. The main treatment method for cough variant asthma is "sparing wind to stop cough, tonifying kidney and purging lung" as the main treatment method. And Professor LIN Lin created ,Xianqi Qinglong, Decoction to remove wind to eliminate phlegm and nourish lung and kidney. According to the progress of the disease, the attack period should be mainly expelling wind and dispersing evil and in the stable period the treatment should be to regulate lung and kidney.