中文摘要：

从旅游城市之间的入境旅游流关系角度，通过绘制旅华美国旅游流分布图，构建旅华美N旅游流网络，运用社会网络分析方法，分析旅华美国旅游流的流向特征、空间分布特征和网络结构特征。结果表明：旅华美国游客主要从北京和上海出入境中国；旅华美国旅游流分布范围较广，以长三角地区最为密集，其中有11个节点城市、4个城市对和5条旅游线路最受游客青睐；旅华美国旅游流网络为“核心一边缘”结构，网络密度低，其中核心节点11个，边缘节点44个；核心节点在网络中承担着扩散中心、集聚中心和中转中心等不同的角色功能，并对边缘节点具有控制作用；网络中存在10个派系，各派系成员个数均较少，口岸节点在派系中多次出现。

英文摘要：

The characteristics of spatial transference, geographical distribution and network structure on US visiting-China tourist flow are analyzed in the paper. The results show that many American tourists enter China from Beijing and Shanghai; the distribution of US visiting-China tourist flows is in a wide range and centralizes in Yan- gtze River delta, Pearl River delta, Bohai rim, Southwest region, especially in Yangtze River Delta. And there are 11 nodes, 4 city pairs and 5 tourist routes most popular with American tourists; the network of US visiting-China tourist flows, with low density, is a ＂core-periphery＂ network, which includes 11 core members and 44 periphery members; the core members play the different roles in the network, such as diffusion center, gather center and transfer center, and control the periphery members; and there are 10 cliques in the network with few members in the cliques and hubs appearing in the cliques frequently.