Psychological capital is a psychological capacity that can be measured, developed and harnessed for performance improvement. Over the past decade, a large number of studies have investigated the relationship between Psychological capital and employee attitudes, behavior and performance. However, in reviewing this literature there is an obvious silence as to the antecedents of Psychological capital. The article reviewed the basic theory of Psychological capital about concept, structural elements, measurement and the antecedents, and the antecedents and the mediating role of Psychological capital from demographics, individual differences, leadership styles and organizational environment. Further research should be dedicated to enhancing basic theory and antecedents of Psychological capital by theoretical and empirical research. Further research should use the method of combining cross-sectional and longitudinal analysis, combining qualitative and quantitative research, and diverse research methods like cognitive neuroscience. Systematic and integrated approaches as to the antecedent’s research are needed.