Objective:To study effective parts of Feijingcao on Anti-influenza virus A. Methods:Using chicken embryo culture to study inhibitory effects of three parts in Feijingcao on influenza virus A proliferation. Results:The n-Butyl alcohol ingredient of Feijingcao has apparent inhibitory effects,The Ethyl acetate ingredien of Feijingcao has inhibitory effects. Conclusion:Effective parts of Feijingcao on Anti-influenza virus A are The n-Butyl alcoh...