| Regional development and spatial structure is one of the important fields in human geography. Regional development has a close relationship with spatial structure. On the one hand, regional development is the impetus of the evolvement of spatial structure ;on the other hand, the evolvement of spatial structure promotes regional development. Catching hold of the reciprocity relation of the regional development and spatial structure, on the basic of the theory of areal division of labour, taking the Jiangsu Province as example, the article constructs the interrelation of regional development and spatial structure through the relation of city and region.This article includes 5 aspects:1. By analyzing the regional development course of Jiangsu province from 1949,especially the analysis of regional economic structure and regional development difference, it sets forth the main characteristic and the cause of formation in different stages from the angle of spatial and temporal evolvement.2. Taking the regional difference as starting point, studying the regional development in different phases from 1978 by the fix quality research, analyzing the cause of regional development of spatial structure of different phases, it points out "in different phases of regional development, the spatial elements of the main influences are different .In the 1980s, the change element are regions, in the 1990s,the change element are dots. The differences of regional development cause the change of spatial element, and lead to the regional spatial structure change in the end".3.It expounds the spatial structure of jiangsu province nowadays. Taking the hu-ning railway as the main axes, the south part of jiangsu is just in the stage of changing from the axes to network; the middle part of jiangsu is in the stage of changing from the point to axes; the north part of jiangsu , in fact in the stage of growth pole .because of the poor economic power from Xuzhou to Lianyugang.4.It points out that the jiangsu regional spatial structure has confined the jiangsu regional development in some degree. It needs to adjust and optimize the jiangsu regional structure. The article discusses the following aspects: 1) By the feasible research of jiangsu regional spatial structure, it points out "The line alone the river becomes the belt. The line struction turns into diamond structure." 2) It points out the mode of jiangsu regional spatial structure adjust and optimize. With the regional economy development and the improvement of basic establishment ,the "一"shape spatial structure along the river will be changed into the"工"shape spatial structure and developed into "Ⅱ"shape spatial structure at last. 3) On the basis of adjusted and optimized spatial structure mode of jiangsu ,it points out the relating envisagion of the south part, the middle part and the north part of jiangsu's regional development and spatial structure development.5.Summarizing the paper's research, it points out the problem that needs to further study.
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