中文摘要：

合理的城市规模布局是城市化进程中最重要的组成部分，城市规模分布过于集中或过于分散都对经济发展不利。本文首次使用跨国面板数据检验了服务贸易与城市规模分布的关系，发现全样本下服务贸易使城市规模分布更加集中，但是OECD国家和非OECD国家存在差异；与全样本回归结果不同，服务贸易却促使OECD国家城市规模分布更加分散，这与两类国家所处的经济发展阶段、在全球价值链中的地位有关。本文研究结论对中国目前发展服务贸易和优化城市体系具有警示意义。

英文摘要：

Effective city size distribution is the most component of urbanization, and too concen- trated or too dispersed city size distributions are detrimental to economic development. Firstly, the author estimated the relationship of trade in services and city size distribution using cross-country data, finding that the development of trade in services makes city size distribution more concentrat- ed under the full sample. However, the regression of Non-OECD countries is different from OECD countries, and trade in services promotes more dispersed city size distribution in OECD countries, which is related with the stage of the two country groups and their positions in the global value chain. Finally, the conclusion proposes some warnings for Chinese urban system and trade in serv- ices development.