To investigate the developmental trajectory of the just-world belief during adolescence,as well as its predictors,a sample of 518 senior one students from three senior high schools in Henan province,China,were recruited for this longitudinal study. They were asked to complete a battery of self-report measures of belief in a just world,friendship quality,and online social support. The results indicated that:( 1) all participants endorsed the general BJW more strongly than the personal BJW.( 2) It was shown that the general belief in a just world...