Abstract：This paper introduces the clinical experience of Professor XIA Xinhua using modified Guizhi and Houpo Xingzi Decoction to treat chronic cough. Professor XIA is well aware of the physical constitution of people in the Lingnan area. In the diagnosis and treatment of chronic cough， he pays attention to the differentiation of constitutions and the yang qi in the lung and spleen and uses Guizhi and Houpo Xingzi Decoction which can unblock yang and dissipate cold to regulate the lung and spleen. Chronic cough is often caused by the external contraction of wind-cold pathogen which has failed to be cured in a long time，with the lingering wind- cold and unresolved exterior pathogen in most cases. It is advisable to use Guizhi and Houpo Xingzi Decoction to release the exterior with acrid-warm and dissipate cold to relieve cough. In the clinical treatment for those who do not show obvious signs of cold and heat，the dialectical concept of "no heat is cold" is advocated and Guizhi and Houpo Xingzi Decoction can be used to warm the lung and dissipate cold and direct qi downward and relieve cough. Chronic cough is more common in diseases of both the lung and stomach；it is recommended to treat the lung and stomach simultaneously，and Guizhi and Houpo Xingzi Decoction is such a representative formula.