环渤海经济圈城市群能级梯度分布结构与区域经济发展战略研究

根据增长极理论、梯度转移理论和城市功能理论，构建了城市能级综合评价指标体系，并运用主成分分析法和SPSS软件对环渤海地区内的各城市进行了城市能级的综合评价，在此基础上又采用系统聚类分析法得到了环渤海经济圈城市群的层级分布结构，最后根据研究结果和相关理论提出了环渤海地区区域经济非均衡发展的建议和策略。

Strategic Research on Grade Distribution of Energy Grade Structure for Huan Bohai Sea Economic Region City Cluster

This article constructs the integrated evaluation index system of city energy grade according to the growing pole theory and grads transfer theory. This article evaluates the energy grade of the cities in Round Bohai Area using the principal component analysis and SPSS. On the basis of these researches, the article brings forth the layer grade distribution structure of Round Bohai Area through cluster analysis and SPSS. In the end, this article brings forth some significant advices and strategies according to research results and correlative theories.