As a sharing platform for files, information and resources, CSN (content sharing network) possessed a very wide distribution in Internet. It did provide a great convenience for people to share various contents through Internet with the rapid development and wide application of network techniques, especially the emergence and prevalence of P2P (peer-to-peer). However, numerous malicious files, cheating information and spywares swarmed into Internet, which pose a serious threat to the security of CSN. A survey was made of some critical issues of CSN combining with the current development and research status from the perspective of network security. The critical issues include the definition and important properties, different taxonomies of types, key techniques, developing and researching trends of CSN.%作为文件、信息和资源等联网内容的共享平台，内容共享网络在互联网中具有十分广泛的分布。随着网络技术的快速发展和深入应用，特别是对等网络的兴起与流行，极大地方便了人们通过网络分享各种内容。然而，大量的恶意文件、欺诈信息和间谍软件等不良内容蜂拥而入，对内容共享网络构成了日益严重的安全威胁。结合内容共享网络的发展与研究现状，从网络安全的视角对其概念内涵、类型划分、重要技术和发展与研究趋势等关键问题进行了综述。
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