This paper aims to explore the relationship among mental health, subjective well-being and personality of post-90s undergraduates. 500 undergraduates are investigated with the use of methods of SCL-90 symptom scale, subjective well-being scale and Eysenck Personality Questionnaire (EPQ). There exists a significant negative correlation between life satisfaction and positive emotion dimensions of subjective well-being and SCL-90 symptom factors and EPQ psychoticism and neuroticism (p〈0.05; P〈0.01), and a significant positive correlation bet...