The “post-90s” refers to Chinese citizens who were born in the 1990s and have entered University. Researchs have showed that the overall level of mental health of “post-90s” were good, at least no worse than the “post-80s”. While it hadn’t yet formed a consensus conclusion on gender, grade, and urban-rural differences of mental health of the “post-90s”. Furthermore, the individual factors, such as personality, coping style and ego identity, together with the environmental factors, such as factors from family, school and society, are the main influencing factors to their mental health. Therefore, in future, the relevant study should pay more attention to the positive psychology of “post-90s”, as well as different categories students’ mental health; research methods should be integrated using the interview, the test method and experimental methods along with Structural Equation Modeling, Multilevel Linear Model and Meta-analysis technology, and longitudinal studies should be actively carried out as well; and the education proposals should organicly combine macro-regulation and micro-interventions.