By investigating Yanjiao and Beijing sub-centre, on both sides of the Chaobai River, it reveals that today more than 40% of the population in Yanjiao travels to and from Beijing for work.  Because of the inequities of political and administrative systems, as well as massive and uncontrolled urbanization, Yanjiao is losing its identity gradually.  Comparing Yanjiao with Beijing Sub-centre on the urban configuration, building typology, topography, and hydrology, the conclusion is that there are: 1) traditional small-scale allays and buildings, 2) significant unidirectional commuter flow to Beijing, and 3) the Chaobai River is not only the administrative boundary but also the development boundary between the two cities. To optimize this situation, three different levels of planning and design have been made:1.Regional planning: To improve the sustainable development situation of Yanjiao through inter-regional synergistic development, while creating more equal urban spaces with a water-based landscape structure. 2.Urban Design: By extracting the traditional urban morphology, local lifestyles, three primary interventions have been created for the design part. Through these three interfaces, the site links the surrounding urban space with a good spatial transition.3.Detailed design: Intervention and feeling of spatial qualities are shown through the rendering of the three interfaces.