Performance is always the focus of enterprises. In order to maintain their survival and improve the competitiveness, enterprises has been explored an effective way to enhance productivity and organizational performance. Many studies have confirmed that job satisfaction and performance had mutual influence. As the competition was intense and the material resources were limited, more and more studies began to consider to improved organizational performance by individual psychological factors. As a developed and sustainable characteristics , psychological capital could make better results in predicting performance than other personality. Therefore, this study aimed to explore the interaction effect of psychological capital and job satisfaction on performance. Then the concept psychological capital of positive psychology and job satisfaction was used in conceiving a model which is about the moderate effect of psychological capital on performance. An experimental design between subjects was conducted with 321 IT employees. The study explored job satisfaction, performance and the interrelationship among psychological capital and the interaction effect. Results showed that: (1) The stronger psychological capital, the better task performance and contextual performance; (2) The more job satisfaction, the better task performance and contextual performance; (3) Psychological capital could moderate the influence of job satisfaction on contextual performance, rather than task performance. When psychological capital was low, though contextual performance could get better as job satisfaction increased, the rate of change was very low; and when psychological capital was high, contextual performance could be better in high amplitude as job satisfaction increased. It was the first study that psychological capital moderated the influence of job satisfaction on performance. And with small amount of resources input, it could improve the satisfaction of employees and the performance of the organization by enhancing the psychological capital. It could bring the sustainable competitive advantage. This study had very important significance in theory and practice.
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