Abstract: From the view of industrial organization， large enterprise cluster is one of the industrial network organizations. From the view of symbiosis theory， large enterprise cluster is an ecological community of different size enterprises. Therefore， a view of industrial symbiosis network is suggested in the paper. According to the network density and the numbers of large enterprises， four structure classifications are addressed including loose solooligopoly， loose multioligopoly， tight solooligopoly and tight multioligopoly cluster. The evolution of large enterprise cluster structure is also studied including positive integration path and negative integration path. In different network， the roles of leader enterprise and symbiosis modes are different.

Key words: large enterprise cluster, symbiosis network, leader enterprise, role analysis