The aim of this study is to investigate the relationship between psychological capital and citizens' behavior and the moderating effect of job characteristics on their relationship. For the purpose of this study with a cross-correlation approach, the sample of 100 people randomly selected from the community of 241 Hormozgan University employees and a combined questionnaires (including three questionnaires, Luthans, Oregon and Kanvsky, Hackman and Oldham) with Cronbach's alpha coefficient (up to 70 percent) were distributed among them. Finally, to analyze the data obtained from questionnaires the designed model with PLS, regression model, ANOVA test, Pearson correlation coefficient and independent T-test were used. The results showed a positive relationship between psychological capital and the behavior of citizens and the positive impact of job characteristics on the strength of this relationship, confirming all research hypotheses except the first hypothesis and indicated the lack of a significant relationship between age, gender and citizenship behavior (OCB). According to the results, more attention to the psychological capital, job characteristics and personality and devolve job with respect to the spirit of the work and the staff's favorites level and also holding educational seminars to increase citizenship behavior are suggested