What factors affect employees propensity to leave has recently received importance and interest in academic and practical fields of human resource management. This study was intended to explore the influence of job satisfaction on organizational commitment which, in turn, affects propensity to leave. In addition, the mediating effect of organizational commitment on the relationship between job satisfaction and propensity to leave was also examined. This analysis is based on questionnaires which are collected from China employees of Taiwan listed and OTC companies. The total of 318 questionnaires were issued, and the valid response rate is 98% (311 of 318 is returned). The method of analysis includes descriptive statistics analysis, reliability analysis, validity analysis, factor analysis, ANOVA, regression analysis, and hypotheses tests. Results showed that job satisfaction had positive effects on organizational commitment. Furthermore, organizational commitment had negative effects on propensity to leave. The results demonstrated that organizational commitment had mediating effect on the relationship between job satisfaction and propensity to leave.