Study on the Characteristics of Beijing-Tianjin-Hebei Spatial Structure and the Spatial Integration

Based on the literature review and theoretical analysis,this paper studies the spatial structure of Beijing-Tianjin-Hebei.Studies suggest that comparing with the Yangtze River Delta city group,the Pearl River Delta city group,and the Central China city group,the relative density of cities in Beijing-Tianjin-Hebei is lower.The spatial distribution of urban system is not balanced,on the one hand,based on the natural conditions,more cities locate in the Southeast,on the other hand,most medium-small towns locate on the main railways.The distribution area of cities can be roughly divided into six lines,which are Beijing-Guangzhou line,Shuozhou-Huanghuagang and Shijiazhuang-Dezhou Line,Beijing-Jiulong line,Beijing-Tianjin,Beijing-Harbin,Beijing-Shanhaiguan line and Zhangjiakou-Chengde.There is a decentralization trend in economic development.The transportation infrastructure within the region is relatively developed,with the changes of the economic spatial distribution,the urban traffic demand within the region changes with it.Finally,considering the transportation system of this region,and urban development orientation,the trend of spatial integration can be summarized as three-axis,four-zone,multi-center network.