<p>Prior studies have demonstrated the long-term effect of adverse childhood experiences on well-being in adults, but scarce studies have investigated the relationship between positive childhood experiences on adulthood well-being. The purpose of this study was to explore the relationship between cumulative positive childhood experiences and well-being in young adulthood using cross-sectional and two-wave longitudinal designs. In Study 1, the path analysis found that cumulative positive childhood experiences were positively related to both eudaimonic and hedonic well-being in young adults at the cross-sectional level (<i>N</i> = 1256). Study 2 further demonstrated that in another sample of young adults, cumulative positive childhood experiences were significantly positively associated with two types of well-being six months later (<i>N</i>=325). Our study provides initial evidence for a positive relationship between cumulative positive childhood experiences and an individual’s long-term well-being. Implications and suggestions for future research are discussed.<?tk 4?></p>