Abstract: Objective To investigate the cognition of evidence based medicine(EBM)among medical staffs in Liao ning province and to explore the way to carry out EBM education.Methods A total of 1010 medical staff in 10 third class first grade hospitals in Liaoning province were investigated with a self designed que stionnaire o n personal info rm ation,related know ledge backg round,the cogn ition o f EBM and its influencing factors.Results There were 929 valid que stionnaires.Of all participants,77 persons(8.3%)knew the EBM very much;300 persons(323.3%)knew EBM a little better;426 persons(45.9%)knew EMB generally;126 persons(136%)didn't knew EBM.The main factors of impacting medical staffto gain EBM knowledge were education,occupation,professionaltitle,position,English proficiency,computer level,the frequency of using database,and reading medical literature.The proportions of the medical staffconsidering that EBM should be put into the diploma course,undergraduate crrriculum,and postgraduate course were 23.7%,58.0%,and 16.1%,respectively.Conclusion The cogniton of EBM is poor among medical staff and EBM education should be streng thened.