Objective: To study self-identity and mental health of the university students.Methods: 3206 subjects were surveyed by three scales: SCL-90,FARS and Self-identity Scale.Results: ①Part of the factors of these three scales showed significant differences at three levels: Gender difference,only-child or not,and internal or external recruit.②The scores of each factor of self-identity were almost significantly correlated with FARS' dimensions.The correlation between the factor of self-identity and factor of menta...