To test the mediator effect of self-perceived peer relationship （T2） on peer relationship （T1） and psychological and behavioral adjustment（T3）. A 3-year longitudinal study was conducted. The participans were 422 elmentary school children ranging from the second grade to the fouth grade. The results indicated that self-perceived social competence exerted a mediator effect on the relationship between social preference and prosocial behavior and loneliness, self-perceived friendship quality exerted a mediator effect on the relationship of the number...
