Previous studies have shown the effect of personality on people’s mental health and the relationship between type D personality and mental health has attracted extensive attention from scholars at home and abroad. However, it is still unknown the whether personality affect health or health affect personality.The present research examined the relationship between type D personality and freshmen's mental health based on alongitudinal design. In addition, the present research explored mechanism of the relationship between type D personality and mental health. In this study, 1403 freshmen from a university in Fujian Province were recruited as subjects. Three longitudinal surveys were conducted in October, November and December 2017. The effects of type D personality (DS-14), resilience (CD-RSIC2), perceived stress (PPS) and mental health (MHI-5) on mental health were investigated by using type D personality scale, Psychological Resilience Scale and perceived stress scale. The statistical methods used are: common method deviation test, descriptive analysis, chi-squared test, correlation analysis and the use of stepwise regression test and PROCESS program to examine a moderated mediation model. Through analysis and discussion, the following results are obtained:(1) Students with different gender and love status had no significant difference.(2)185 out of 1132 freshmen were tested as type D personality, the detection rate was 16.25%.Among male and female students, the detection rate of type D personality is different.(3) Mental health was positively correlated with negative affection, and negatively correlated with resilience. Perceived stress was positively correlated with social inhibition, negative affection and mental health, while perceived stress was negatively correlated with resilience.(4) Type D personality dimension indirectly affects mental health through perceived stress mediation.(5)Resilience significantly moderated the relationship between social inhibition and mental health and the relationship between perceived stress and mental health.(6) A moderated mediation model was confirmed.College freshmen who had higher, type D personality tended to perceive higher pressure and lower mental health. The perceived pressure played an intermediary role in the impact of type D personality on the mental health of college freshmen. Resilience could buffer the negative effects of social suppression on mental health directly, and reduce the indirect effects of social inhibition on mental health by perceived stress. The results not only help us to understand the psychological condition of college freshmen, but also provide us with evidence for improving their mental health.
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