Background: Creativity is an effective key agent in the domain of social science, psychology and educational activities. In the modern world, survival and success of human activities in the different domains depend on their creativity. Creativity is standing on different factors such as psychological capital and achievement motivations.Purpose: The purpose of this research is to find a relationship between the psychological capital and students’ creativity considering the mediation of achievement motivation.Method: The research methodology was descriptive-correlational, and structural equations modeling also was used. For descriptive analysis of data between mean, standard deviation and inferential analysis technics, path analysis was used. The statistical population of the research included all undergraduate and graduate institutions of higher education in Higher Education Center of Samangan. The number of statistical population in the basis of Cochran Formula is 240 persons selected with stratified random sampling method. The data collector tools contained Lathans psychological capital, achievement motivation Hermes and Abedi creativity questionnaires. The validity of the questionnaires was in an acceptable level.Findings: The findings of this research showed that: 1. three factors of psychological capital, including hopefulness, self-efficacy and optimism, positively and significantly were related with achievement motivation, 2.achievement motivation had a positive significant effect on creativity, and 3.psychological capital with mediation of achievement motivation, had an indirect positive effect on creativity.Conclusion: Standing on research findings, increasing of psychological capitals of students by universities, enhances their achievement motivation and creativity, through them, the efficiency and productivity procedure of society’s activities improved.