Spatial Temporal Evolution Of Urban Spatial Interaction In Sichuan Province

City is an entity of geography,economy,society and culture,and a synthesis of various human and natural elements,city is the center of regional economy development,it bears the political,economic and cultural functions of human society.There are constant exchanges of information,energy,material,personnel,and various factors of production between cities,these exchanges and flows are called spatial interaction.As far as Sichuan province is concerned,the development gap between regions is increasing,as the provincial capital-chengdu's development level is much higher than other cities in the province,at the same time,the development level of the eastern regio n of the province is obviously higher than that of the west.Therefore,that is great of significance to study the changing of space-time pattern of spatial interaction among cities in Sichuan province,building a group of urban agglomerations as the main body of the urban development system,play the leading role of the core city of surrounding areas,to promote exchanges and cooperation Sichuan province and all kinds of resourc es among cities in the province of sichuan,support to guide the whole sichuan provinc e the rapid harmonious development of social economy,to promote the implementation of Sichuan province multi-level multi-point support development strategy.In this paper,all analysis starting from the connotation of space interaction,establishing the index system includes the establishment of external radiation force,bet ween the city and city circulation 3 cohesion indexes and 16 level two indexes of Sichu an province city spatial interaction index system.Index weight calculated by structura l equation model,based on improved potential model,combined with the gravity mode l to measure the gravitational interactions among cities,according to the potential and gravity measurement results of urban spatial interaction pace-time evolution of Sichuan province were analyzed.The main conclusions of this paper are as follows:(1)From the time point of view,from 2004 to 2014,the urban spatial interaction in Sichuan Province was not stable due to the quality of urbanization.However,due to the path dependence,the changing of spatial level of spatial interaction in Sichuan cities was small.(2)From the spatial evolution,from 2004 to 2014,due to the obvious effect of the growth of the core cities of the urban agglomeration,the spatial interaction of the core cities is stronger than that of the non-core cities,and as for the marginal cities of Sichuan Province are affected by spatial distance and friction,the level of urban spatial interaction of these cities are relatively poor.