中文摘要：

借助社会网络等非正式制度方式实现再社会化是乡城流动人口融入城市生活的主要途径之一。对流动人口社会网络的分析不仅可以揭示其网络结构特点，也将为进一步研究流动人口再社会化过程提供理论基础。采用深圳市流动人口专项调查中的整体网络数据，借助复杂性科学，尤其是复杂网络的研究方法，系统分析了乡城流动人口社会支持网络与讨论网络的复杂性特征。在乡城流动人口社会网络中广泛存在小世界现象和无标度特性等复杂网络特征。复杂性科学可以为分析诸如乡城流动人口这样的复杂系统提供有效方法，也是拓展复杂性科学，尤其是复杂网络应用领域的有益尝试。

英文摘要：

Social networks constitute an important component of adaptation by Chinese rural-urban migrants to life in cities. Understanding these social networks not only clarifies features of their social interactions, but also provides information about the process of their re-socialization. Using data from ＂Shenzhen Rural-urban Migrants Survey＂ in 2005, key properties of the rural-urban migrants＇ social support networks and social discussion networks are explored. The results indicate that these social networks are not random, but exhibit features of both smallworld and scale-free networks. This study indicates that the complexity science can provide some new approaches for analyzing the complex system, such as the rural-urban migration system, and extends the application scope of the complexity science.