To study on plan element of the region unit plan, this study is tried to investigate from 1st to 2nd newtown. In spite of residential site has a multi functions as an organism with continuity and networking, it is a separated part in urban space with site unit-oriented. But the region unit plan has not play a roles to control urban environment The results of the study about inter-residential site and planning typology are follow. Firstly, Policy direction and plan tools are established to have consistency in the large scale development project or newtown. Secondly, Plan technique must be adopted to continuous development and three -dimensional investigation from plan beginning of project. Thus, It is to be compose that project team as total plan frame. Thirdly, Special plan should be devise to develope typology of region unit plan that control urban environment.