Abstract Based on Institutional Theory and Self-categorization Theory , , this research explored how employee identity diversity of State-owned Enterprises (SOE) impacted on employees’ organizational attachment through questionnaires collected from SOE employees. It showed that employee identity diversity reduced the employees’ psychological commitment significantly, and the mediating effect of pay legitimacy and identity type on this relationship is positive. The study enriched the literature foundation about diversity, and also gave some valuable guidance for state-owned enterprises to put forward relevant management policy.
