Nursing services is a high stress job. To improve the life quality of nursing staffs, we explored the relationships among psychological capital, job immersion, and life quality in nursing staffs, and verified that the psychological capital plays an intermediary role between the job immersion and life quality in nursing staffs.General data questionnaire, job immersion scale, psychological capital scale, and life quality scale were performed in nursing staffs who were from 6 third-class hospitals including 2 hospitals in Jinzhou city, 2 hospitals in Chaoyang city, and 2 hospitals in Huludao city. The relationships among psychological capital, job immersion, and life quality, and psychological capital as an intermediary role between the job immersion and life quality were analyzed using SPSS20.0 and AMOS19.0 softwares.In these nursing staffs, the total scores of the job immersion, psychological capital, and life quality were 47.45 ± 9.41, 65.63 ± 10.35, and 72.35 ± 11.24, respectively. The psychological capital was positively correlated with the job immersion (r = 0.452, P < 0.001), the job immersion was positively correlated with the life quality (r = 0.344, P < 0.001) and the psychological capital was positively correlated with the life quality (r = 0.314, P < 0.001). Structural equation models showed that the job immersion could indirectly influence the life quality through the psychological capital. The mediating effect of psychological capital was 0.156 which accounted for 33.19% of the total effects.The psychological capital should be improved, and the psychological capital combined with the job immersion together improves the life quality of nursing staffs.