Abstract: In order to explore the relationshipbetweenlife events and sense of achievement, and to test the mediating role of belief in a just world and moderating role of phubbing, 3104 teenagerswere tested with "Adolescent Self-Rating Life Events Checklist", "Belief in a Just World Scale" and "Sense of Achievement Questionnaire". The results show that:(1)After controlling factors of gender and age, there is a significantly negative correlation between adolescents' life events and their sense of achievement; (2) Belief in just world partially mediates the relationship between life events and sense of achievement; (3) The direct and second half of the mediating pathways of "life eventsbelief in a just worldsense of gain"are moderated by phubbing. In short, there are both mediating and moderating effects between life events and sense of achievement. This study reveals the relationship between life events and the sense of achievement and the individual differences, and provides theoretical andempirical basis for improving the sense of gain of adolescents.