中文摘要：

运用角色理论,将联盟企业划分为主导者与辅助者,研究企业的主导地位与辅助地位影响企业加入联盟的倾向。运用新颖的社会网络实证统计分析工具——指数随机图模型（ERGM）,选取中国风投行业的联合投资样本,检验以上两类地位在企业联盟形成机制中的作用。结果表明,企业能够主导（辅助）联盟的可能性与企业主导地位（辅助地位）之间存在倒U型关系。辅助地位的倒U型门槛值的大小,受到企业所在地的企业集聚程度的负向调节,但针对主导地位倒U型门槛值,不存在这种调节作用。

英文摘要：

Based on the role-theory,authors divided the roles of firms in the alliances into leadership role and supporting role,namely primary status and complementary status accordingly.We firstly introduced what the two statuses were,and then focused on finding out how these two kinds of statuses influence the likelihood of alliance formation.Through applying Exponential Random Graph Model（ERGM） and syndicated venture capital data in China,results showed that there was an inverted U-shaped relationship between a firm＇s primary status（complementary status）and its likelihood of alliance formation with the same role in the past.The author also examined how this relationship may vary with the different degree of industrial clustering.The results found that there was a significant negative moderate effect between industrial clustering and the threshold of complementary status inverted U-shape,which did not have the same function to the primary status＇ inverted U-shape.