Using a real case with 252 samples, we investigated the relationships among service integrators' power, service suppliers' relationship commitment, competitor network competence and service supply chain integration in service industry of South China. The empirical results revealed that service suppliers' relationship commitment mediated the relationship between service integrators' power and service supply chain integration, and that competitor network competence moderated the relationship between service integrators' power and service suppliers' relationship commitment. These findings can be applied to help managers understand the role of power and relationship commitment and manage them better, enhance network competence for firms and promote integration performance of the whole service supply chain.