From one-way to interactivity：difficulties and strategies in the planning of adjacent areas of metropolis

The Yangtze River Delta metropolitan region is one of the six largest urban agglomerations in the world. Its regional integration development is a key point of the Chinese government’s regional coordination strategy. And also, establishing the Yangtze River Delta integration model zone has become a national strategy. There are a high degree of urbanization, huge population and large economy by nominal GDP in this area. The core area of the Yangtze River Delta is headed to the north and south with Shanghai as the leader. The two regions have been unbalanced for a long time. Among them, the urban agglomeration represented by southern Jiangsu in the north wing region is a traditional rich land in the south of the Yangtze River. The development level and scale are much higher than those in the south wing region, especially the Kunshan Huaqiao. Under the guidance of Rail Transit Line, The level of development is relatively high, and it is closely related to the central city of Shanghai, and it plays the function of the residence of the employed population in Shanghai. In contrast, in the south wing area, the development is relatively slow. From the perspective of the scale and level of urban construction, compared with Jiading and Huaqiao in the north wing, Songjiang, Jinshan and Zhejiang Jiashan in the south wing are currently less connected, and there is no rail transit and other great luck. The amount of commuter transportation is only traditional railway transportation, such as railways and highways.Achieving high-degree coordination between different cities, especially in cross-administrative regions, is the focus of planning and related academic research. Based on a practical project, this study focuses on the adjacent area of Shanghai. According to the history, culture, ecological space and urban development of Fengjing Town of Shanghai and Jiashan County of Zhejiang Province, the study，from a micro-perspective，analyzed the functional coordination, infrastructure connectivity,conservation of ecosystem and administrative barrier in the process of regional coordination and proposed the following planning strategies: first, preserving Fengjing Ancient Town cooperatively to promote the image of both cities，jointly protect ecological resources such as the water environment; then, building international schools, hospitals, high-quality residential areas and some other projects to enhance the area’s vitality , and attract working-age population from Shanghai; finally, replanning the regional traffic, connecting the impasses and improving the infrastructure and service of transit transfer ,such as the intercity railway transfer. Based on the project, this study summarized three major difficulties in a regional cross-border coordination planning: First, a cross-administrative planning involves multiple administrative subjects and usually causes huge costs due to poor communication; secondly, there are conflicts of interest between the two administrative subjects in adjacent areas, increasing the difficulty of planning implementation; thirdly， it is difficult to do a cross-border management and the technical standards are also different.How to solve these problems, the future needs to be further explored and coordinated by multi-participation including urban managers, planners and the public.