Study on the Changes of Industrial Division Among the Cities in the Beijing-Tianjin-Hebei Region
基于2004、2008和2012年数据，用专业化指数和灰色关联法分析京津冀城市间产业分工的演变，发现区域专业化水平不高且持续下降，但分工趋势有所加强。
The reasonable industrial division and industrial structure optimization is the key of rational allocation of regional resources. The focus of Beijing- Tianjin- Hebei region development issues is to study how to promote the rationalization of region industrial division and how to promote regional economic coordinated development. In this study, based on the data from China City Statistical Yearbook, using industrial specialization index and grey correlative analysis method, estimated and analyzed the situation and evolution process of industrial division among cities in BeijingTianjin- Hebei region in 2004, 2008 and 2012. The results showed that, relative to china for reference, the level of industrial specialization in Beijing- Tianjin- Hebei region was not high and was still falling, while relative to BeijingTianjin- Hebei region for reference, the degree of similarity between the industrial structure of every city and the whole region wasn't very high, and presented obvious divergence phenomenon. So the regional industrial division was not very obvious but strengthened.