Abstract：Objective To explore the influence of maladaptive perfectionism on non-suicidal self-injury, and analyze the mediating effect of cognitive fusion and sleep quality, and the moderating effect of family function. Methods A total of 843 middle school students were surveyed by using the Chinese version of Frost multidimensional perfectionism scale（FMPS）, the adolescent non-suicidal self-injury assessment questionnaire, the cognitive fusion questionnaire（CFQ）, the Pittsburghsleep quality index（PSQI）, and general functioning scale of the family assessment device（FAD）. Results Maladaptive perfectionism, cognitive fusion, sleep quality, self-injury behavior, and family function were significantly positively inter-correlated. Maladaptive perfectionism indirectly affected self-injury behavior through the mediating effects of cognitive fusion and sleep quality, and the serial mediating effect of cognitive fusion and sleep quality. Two paths of the model were moderated by family function. Specifically, the direct effect of maladaptive perfectionism on non-suicidal self-injury and the influence of sleep quality on non-suicidal self-injury in individuals with good family function were weaker than those in individuals with poor family function. Conclusion The results reveal the influential mechanism of maladaptive perfectionism on adolescent non-suicidal self-injury and the protective effects of psychological flexibility, sleep quality, and family function, which provides enlightenment for preventing and intervening non-suicidal self-injury of adolescents.
