Chronic cough is a common clinical disease，and it is sometimes a refractory disease with complex pathogenesis and the mixture of deficiency and excess.Professor Dong Jingcheng believes that the patients with chronic cough often have clinical and microscopic manifestations of kidney deficiency.Therefore，the treatment should focus on tonifying kidney and replenishing qi，which can be supplemented by soothing liver and invigorating spleen，regulating qi and resolving phlegm，and clearing heat and activating blood.The physicians can follow the principles of treating the lung at the time of onset with consideration to the kidney，treating the kidney at ordinary times with consideration to the lung，treating the lung from kidney，and treating the kidney from the lung.Tonifying both lung and kidney can effectively treat chronic cough.