This paper proposes a novel mediating model from the identity-based perspective to investigate the relationship between internet use and subjective well-being,with social support as a mediator.Based on national panel data,the study comprehensively examined the impact of virtual identity-based internet use on subjective well-being.Through structural equation modeling analysis,the study found that internet use primarily exhibits a significant negative effect on subjective well-being;social support has a significant positive influence on subjective well-being in the same period,but it shows a significant negative influence in the lag direction.The mediating role of social support does not yield consistent evidence,and it was mostly observed in the same period effect of each year.In sum,this paper reflects the dynamic relationship between internet use and subjective well-being among people in China and offers theoretical considerations for improving people's well-being in the digital age.