Based On The Accessibility Of The Inter-city Rail Transit City Cluster Of Shandong Peninsula And The Spatial Structure Evolution

City cluster is the focus of future urban development in our country, it is the heart of the most dynamic and potential in economic development, the formation and development of city cluster and the development of transportation system supplement each other, the development of the transportation network plays an important role in the development of the city cluster. Along with the development of social economy, city cluster internal communication, inter-city passenger volume increased obviously, the demand for the inter-city traffic. The inter-city rail transit for its efficient, fast and convenient, the characteristics of large capacity has become one of the important transportation way of intercity travel.City cluster of shandong peninsula is located in the eastern coastal areas, the rapid economic development in recent years, according to the shandong peninsula city cluster inter-city rail traffic planning "to the city cluster of shandong peninsula in2020will be more perfect the inter-city rail transit network. There will be a far-reaching impact on city cluster. The article introduced the concept of accessibility, in2012and2020for the study of the node inter-city rail transit network’s influence on the function of city cluster form and inter-city site surrounding area development analysis.The article studied the three aspects of contentFirst, It is in accordance with the present situation and plan, choose the weighted shortest travel time, in2012and2020, the shandong peninsula accessibility level evaluation, from the level of cities and regions for accessibility level is analyzed.Second is into the economic center of time as accessibility research foundation, the center at the heart of the city was divided by the shortest travel time attract area and dense area, research center of city and city cluster overall attract area spatial structure evolutionThree is the study of the inter-city site surrounding area function. Centered on intercity station defines internal advantage city development area, and research of the difference of different grade advantage of city development area function of agglomeration.