Organizational commitment has been measured by the scholars in various ways, but the previous theoretical or empirical research devoted to organizational commitment has been based on the assumption that the level of organizational commitment develops with tenure displaying a rapid decrease after entry the organization, followed later by a steady increase. On the basis of the career-cycle development literature, a cycle model of organizational commitment level was presented and the bar charts method used to examine changes in organizational commitment with tenure. In opposition to existing theories and results, the cycle model of organizational commitment level indicated that organizational commitment level with tenure displayed a cycle change, and significantly predicted five stages: shock, identification, steady, rumination and entrenchment periods. As a result, it is important for the organizations to improve the condition of employees' organizational commitment level and reduce employees' turnover.