中文摘要：

Churn问题是P2P网络面临的基本问题之一．通过系统地归纳现有文献，从Churn问题产生的机理出发，总结出解决Chum问题的主要步骤，依次是准确度量Churn，分析Churn对P2P网络性能的影响，给出应对Churn的具体策略以此为主线对Chum问题的研究进展进行综述，全面，深入，系统地总结了每个步骤中涉及的关键问题以及解决这些问题的具体方法与最新成果．讨论了存在的问题并指出未来可能的研究方向．

英文摘要：

Chum is one of the main problems faced by all P2P networks. This paper surveys the existing theories and methods about Chum. On the basis of the generation mechanism of Chum, this study summarizes the major steps of the Chum problem solution： precise measurement of Chum, analysis of the impact of Chum on P2P performance, and provision of specific strategies to handle Chum. Under each step, existing problems, solutions, and the newest recent research are explored. This paper also discusses the prospects of future studies.