Abstract：The clinical experience of professor LONG Qianling in the treatment of recurrent respiratory tract infection is summarized from the following aspects：when cough occurs，we should not just think of relieving cough；we cannot tell whether the syndrome is cold or heat only by the color of phlegm；the development of chronic cough is a course of gradual deficiency of healthy qi；cough is a manifestation of the lung qi failing to diffuse，and San'ao tang is the basic prescription for the treatment of wind- cold cough；Zhisou powder is used for end- stage cough；the Chinese medicine for treating cough should be light；fresh ginger，ginkgo nut，and rice are the standard Chinese medicines used in the medication of cough；to treat cough is to regulate the spleen and the stomach first.