Abstract：Based on the 58 research papers concerning graduates' mental health with SCL-90 scale, we did a meta analysis to systematically assess the mental health status of postgraduates in the past 15 years and found: compared with the national norm, the average effect sizes range from- 0. 17 to 0. 23, which indicated the mental health of postgraduates was not serious; the level of mental health was not significantly different between male and female postgraduates; the year of publication, major, university quality, locality and publication quality were influence factors working on postgraduates mental health status, with the former three accounting for 40. 3% and the year of publication as the major influence factor accounting for 27. 2%; postgraduates' mental healthy level has a tendency of increasing in the past 15 years.

Keyword：postgraduates;SCL-90;meta-analysis;