Taking 2569 SCI/SSCI journal papers in Web of Sciencefrom 2008 to 2017 as research subjects,using literature metrology and content analysis method,the authors carried out a statistical analysis in terms of annual distribution,journal distribution,core keywords distribution,distribution of high-frequency cited literature,etc.Results show that the field of physical activity of international adolescents includes qualitative research and quantitative research.Qualitative research covers a wide range of subjects,including medicine,psychology,education,sports,biology,chemistry,nursing and anthropolo...