The role of positive psychological capital of an organizational member on organization effectiveness has received serious attention from researchers. However, the previous research has focused mainly on the direct effect of positive psychological capital on organization effectiveness, not paying enough attention on a mediating or a moderating role in their relationship. The purpose of this study is to finding out relationship between employees' positive psychological capital and job satisfaction, organizational commitment and the mediating role of positive emotion. Based on advanced literature, we regard positive psychological capital as four factors, self-efficacy, hope, optimism and resilience. We tested the proposed relationships using date from 350 employees in Chinese firms. The main finding are as follows: First, self-efficacy, hope, optimism, resilience has a significant positive effect on organizational commitment, job satisfaction and positive emotion. Secondly, self-efficacy, hope, optimism, resilience influence directly and indirectly on organizational commitment, job satisfaction. Positive affect plays a mediating role between variables.