中文摘要：

门户型中心城市在区域发展中具有强大的吸引能力、辐射能力和综合服务能力，本文运用区位商和城市流强度定量分析方法，对我国19个门户型中心城市的区位商、城市外向型功能量、城市流强度和城市流倾向度进行比较分析，揭示了它们发展中的空间差异，指出了我国门户型中心城市提高城市服务水平、加强城市流强度、增强城市综合竞争力，以整体提升城市能级的对策措施。

英文摘要：

Gateway central cities are the key portal and important port of the external contacts and links of a country or region. Using the LQ and the intensity of urban flow quantitative analytical methods, this article calculates the 19 gateway central cities＇ location quotient, the intensity of urban flow, the degree of tendency. Then the article reveal s the spatial difference of urban development in China. Last article points out what gateway central cities should be in enhancing the urban service industry level and the intensity of urban flow, the city＇s comprehensive competitiveness. The article expects the research results can give important implication on the process of gateway central cities upgrading the modern service level.