Proactive personality is defined as a disposition of being relatively unconstrained by situational forces, and toward taking action to influence one’s environment. Studies have indicated that proactive personality is related to a host of outcome variables, including individual work-related outcomes, career outcomes, team effectiveness, leadership effectiveness, newcomer adjustment, and entrepreneurship. This paper summarized the theories and studies on proactive personality in the domain of I/O psychology, and pointed out some prospects for the future research such as the cross-cultural studies of proactive personality and the moderating effect of organizational factors. ersonality, proactive behavior, measurement, consequences