Medical applications of triterpenoid

The invention provides applications of a triterpenoid shown in structural formula I and a stereoisomer, a raceme, a solvate and a polycrystalline body of the triterpenoid or the triterpenoid shown in structural formula I and pharmaceutically acceptable salts of the stereoisomer, the raceme, the solvate and the polycrystalline body of the triterpenoid to preparation of drugs for resisting influenza viruses, wherein R1-R6 are defined in the specification. 本发明提供种结构式I所示的三萜类化合物、其立体异构体、外消旋体、溶剂化物、多晶型体，或结构式I所示的三萜类化合物、其立体异构体、外消旋体、溶剂化物、多晶型体的药学上可以接受的盐在制备抗流感病毒药物中的用途，其中R～R如说明书中的定义。