This study aims at examining effects of green management of common spaces for formulating community and landscape development in detached housing areas. The study clarifies the following points through the results of questionnaire survey to the residents and observation survey. In detached housing areas, through maintenance of the green in common spaces, residents mutually look at neighbors' face, exchange greetings to neighborhood and support to maintain the green in common spaces. The community has closed friendship through cooperative maintenance of the green. A cooperative maintenance of green in common spaces strengthens residents' community, resulting in contributing to formulate a better landscape in the areas.