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Spatial Structure of Urban System and Its Evolution in Jing-Jin-Ji Urban Agglomeration

ZHAO Jinli;ZHANG Lulu;SONG Jinping;Faculty of Geographical Science,Beijing Normal University;  
Based on the gravity model and potential model,the economic linkage intensity,effect direction and effect range of cities in Jing-Jin-Ji urban agglomeration in 2000 and 2015 were measured. The results show that: Firstly,the gravitation region of Beijing(urban district) and Binhai New District have extended outwards continuously with time and causes the decrease of gravitation region of major central cities located in circumjacent area,however,the gravitation region of central cities in southern Hebei change little and the growth pole position of Shijiazhuang(urban district) has been increasingly highlight; Secondly,the grade of most node cities get reduced,especially for the node cities located in Hebei Province; Thirdly,the lower grade node cities which are not municipal districts increase and are mainly distributed in the 1 st urban region with Shijiazhuang(urban district) as the center; Finally,the spatial structure of Jing-Jin-Ji urban systems has become more stable,but there is a lack of node city with a certain level in the three 1 st urban regions and the basic structure remains to be perfect.
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