Objective To investigate TCM syndrome characteristics and change laws in the patients with cough variant asthma （CVA）. Method Through the review and analysis of the relative documents and research materials there were 62 common symptoms and manifestations of tongue and pulse of CVA chosen in clinic

and an uniform observation table of symptomatology was established for the systematic observation and study on 265 patients with CVA. Result The characteristic manifestations of core symptoms and peripheral symptoms of CVA were summed up primarily. The symptomatologic change laws were brought forward that the syndrome of wind evil attacking lung was the core syndrome type and other 5 basic syndrome types （syndrome of cold evil attacking lung

heat evil accumulating in lung

liver-fire attacking lung

consumption of lung-yin and deficiency of lung-qi） were intercurrent. Conclusion The syndrome of wind evil attacking lung and failure of lung in disseminating and purifying is the key of CVA onset

and the therapy of dispersing wind should be used from the beginning to the end of the treatment of CVA.