With the rapid growth of the scale, complexity and heterogeneity of Peer-to-Peer (P2P) systems, the handle of the peer’s network-oblivious traffic and self-organization has become a great challenge. A potential solution is to deploy servers at different locations as appropriate. However, due to the unique features and requirements of P2P systems, the traditional placement models cannot yield the desirable service performance. In this paper, we propose an efficient server placement model for P2P live streaming systems. Compared to the existing solutions, this model takes the Internet service provider (ISP) friendly problem into account and can reduce the cross-network traffic among ISPs. Meanwhile, the peers’ contribution is introduced into our model, which makes it more suitable for P2P live streaming systems. Moreover, we deploy servers based on the theoretical solution subject to practical data and apply them to realistic live streaming applications. The experiment results show that our model can reduce the amount of cross-network traffic, improve the efficiency of systems, has a better adaptability to Internet environment, and is more suitable for P2P systems than the traditional placement models.