There are 300,000 life insurance salespersons in Taiwan, and it is difficult to survive in such a competitive market for business people. Business people and therefore must have a high compression and positive attitude to face the front of the entire competition. This thesis collected 204 employees as subjects from the Trans Globe life insurance company salespersons in Taiwan. This thesis tests the mediating effect of psychological capital (PC) on the relationship among emotional intelligence (EI), job performance (JP) and organizational citizen behavior (OCB). In this thesis, we propose research hypotheses and verify them by using structural equation model (SEM). Our empirical findings indicate that (1): Good EI increases psychological capital; (2): Good EI increases Organizational citizen behavior; (3): Psychological capital serves as a mediator between EI and Job performance; (4): Psychological capital serves as a mediator between EI and Organizational citizen behavior; (5): The perceived organizational support serves as a moderated mediation between Psychological capital and Organizational citizen behavior. Finally, we discuss implications of these findings, suggestions, and directions for the executives of the said industry.