Chinese medicine has unique advantages in the treatment of chronic bronchitis,as long as it has correctly syndrome differentiation and proper prescription,satisfactory effect is usually obtained.The patients with chronic bronchitis often have symptoms of cough and expectoration,cough with dyspnea often relieves following the reduction and disappearance of phlegm,Therefore,syndrome differentiation and treatment of phlegm is very important in treating chronic bronchitis.This paper discusses the production mechanism,clinical symptoms and treatment strategies of cold phlegm,damp phlegm,heat phlegm,dry phlegm and stagnant phlegm which are common in clinic.And according to deficiency of kidney yang,deficiency of kidney yin,deficiency of kidney essence,the way of nourishing kidney is discussed respectively,which is of positive significance for clinic.