The article first proceeds from the considerations of concept, formative mechanism and competitive edge of industrial clusters, then considers that the good support of service industry is the essential condition to form and develop an industrial cluster and to maintain the competitive edge. If we devote major effort to developing the relative industry of services and do justice to their integrative functions, Zhengjiang industrial clusters, as a distinguishing and superiority feature of Zhejiang economy, can get further development, thus can promote their competitive edge.