This study uses hierarchical regression to explore the internal marketing and organizational citizenship behavior relations and online community participation of moderating effect. The study used the questionnaire survey method. 200 questionnaire were distributed, and received 178 effective questionnaire. In theory, the enterprises promote internal marketing should be able to raise their organizational citizenship behavior, and if they use of online communities to promote internal marketing, online communities participation would moderate with the internal marketing on organizational citizenship behavior. Our results show that internal marketing have significantly positive effect on organizational citizenship behavior, online community participation on internal marketing and organizational citizenship behavior are only slightly significant.