Abstract：This paper considers employee training as a measure of health investment to explore the impact of various personality traits on health investment with methods of the OLS regression and the PSM using the 2016 Chinese enterprises-staff matching survey ( CEES) data. The results show that the personality traits of employees have a significant impact on health investment and have a causal effect. Specifically, the positive personality traits of openness, sense of responsibility and extroversion have positive effects on health investment, with marginal effects of 65%, 32.1% and 40.2%, while in the negative personality traits, neuroticism has a negative effect on health investment with a marginal effect of 17.3%, whereas the effect of homo geneity on health investment is not significant.