According to the social identity Theory, leadership group prototypicality have an important effect in employee’s group identity, work attitude and employee well-being. In this article, we explore the mechanism between leadership group prototypicality and employee well-being to understand how leadership group prototypicality works. We had a sample of 336 employees to test our hypothesis in communication carriers in Guangdong. We used the longitudinal survey and collected the data in three different time point. At last, regression method was used to analyze the data. The results showed that: 1) leadership group prototypicality group could predict employee well-being; 2) mediating effect of group commitment was proud between leadership group prototypicality and employee well-being; 3) moderating effects of openness were found upon the relationship between leadership group prototypicality and group commitment. Finally, this study proposed management practice for leadership group prototypicality, and proposed future research prospects.