The authors collected 64 documents from 2000 to 2015, which with SCL-90 as a tool to investigate postgraduates" mental heath. Then they used the cross-temporal meta-analysis technique to examine the changes patterns in the mental health of Chinese postgraduates. The results showed: (1) The mental health level of Chinese postgraduates increased steadily in the past 16 years. Especially, among which obsessive compulsive, interpersonal sensitivity, depression, anxiety, hostility, paranoid ideation and psychotic change most significantly. (2) There were significant differences between groups: All factional mean scores of the SCL-90 collected with date collection year negatively, the mental health level were better variations for key than non—key universities. Although male postgraduates" factional mean scores of the SCL-90 were lower than females", whereas the changes over time were no difference for them. Depression and paranoid ideation of male and female postgraduates changed most significantly. There were no differences in terms of cross-time changes between regions. The mental health level of medicine majors showed a slowly increasing trend, and the part of them were improved.