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中文摘要：
为了了解城市网络的变化特征，以长三角、珠三角和京津冀经济区为研究对象，获取了各个经济区内两两城市的百度指数之用户关注度数据，模拟计算了百度信息流，分别构建了我国三大经济区的城市网络，并对其2009—2012年的时空变化特征进行了对比分析。得到主要结论：1）基于百度信息流的城市网络具有明显的层级特征，并呈现出不同的空间特征及变化；2）在城市网络的时空演进方面，城市彼此之间的信息联系日益紧密，但城市网络空间发展的均衡化与极化等级现象并存；3）由于百度信息流有着更强的跨越属性，为发展中的新兴城市提供更多的机遇，且这种正效应的影响正在逐步显现。
英文摘要：
Taking the Yangtze River Delta, the Pearl River Delta and the Beijing-Tianjin-Hebei economic zones as the research object, the paper made a study based on the Baidu Index ＂through the area contrast＂ to obtain city＇s ＂Degree of Consumer Attention＂, and simulated the Baidu information flow, then constructed the city network of each economic zone, and made comparative analysis of their spatio-temporal evolution characteristics for the period from 2009 to 2012. The main conclusions were as follows： 1）The city network based on Baidu information flow had obvious hierarchy, and reflected the different spatial characteristics; 2）The information contact between cities was increasingly close in the spatio-temporal evolution of city network, while the equalization and polarization coexisted; 3）As the Baidu information flow had strong property of striding across, it would provide more opportunities for the developing cities, and the impact of this positive effect was gradually becoming apparent. It is considered that this paper would provide a new perspective for the study on city network under the influence of globalization and informatization.
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