Border Effect of Complex Network: An analysis on the cooperation network of movie stars across different regions

People always carry out social activities within certain geographic space. The geographic boundary likes national boundaries and provincial boundaries functions as dividing policies, distributing administrative resources, defining the scope of application of laws and regulations or even the boundary of cultural region, producing fundamental influence on lifestyle. Network analysis is a powerful tool to abstract complex system. In this article, we used network method to understand changes of cooperation network in movie industry and effect of geographical boundary.