中文摘要：

内容网络通过在Internet上部署由多个服务器组成的服务节点来构成覆盖网，有效解决了新应用对网络的多样性需求与Internet尽力而为服务之间的矛盾，一直是学术界和工业界研究的热点．服务节点部署是内容网络研究的一个核心问题，部署好坏将直接影响到覆盖网络的服务质量和运行效率．随着Internet和网络应用的发展，内容网络所处的网络环境、服务质量的要求和与网络运营商之间的关系都出现了新的变化，传统服务节点部署理论面临着众多的新挑战．近年来，如何改善现有的服务节点部署理论已成为一个热点问题．文中系统总结了现有内容网络服务节点部署理论与应用，及其面临的挑战，针对挑战提出了新的研究方向与解决方案．

英文摘要：

By deploying service nodes, which composed by multiple servers in diverse geographical locations, to form the overlay network, Content Networks can effectively reduce the gap between the demand of ever-emerging application for network diversity and the property of the best effort for Internet. It has been the research focus in academy and industry. The deployment of service nodes, one of key problems in content network, affects directly the quality of service （QoS） and operational efficiency of the overlay network. However, with the development of Internet and network application, the environment of content networks , QoS requirements and the relationship with network operators have changed, the traditional deployment theories face many new challenges. Recently, how to improve the existing service nodes deployment theory has become a hot issue. In this paper, we systematically survey the existing service node deployment theories and their applications, address the challenges faced. For the challenges, we also present the research tendencies and the potential solutions in final.