This paper is a report of a study on the ways of practical use of Community Renewal Regulation, for Improvement of Houses and Housing Environment on high densely residential areas where have many older-houses and no infrastructures. We classified the patterns of each action area's improvement programmes based on this Regulation by purpose of action and improvemental method. In this study, we found that this Regulation is mainly usefull for purchasing and demolishing older and unfit houses to live in, and planning and building some small parks, assembly houses and footpathes. But it is not so usefull for planning infra-structures and redeveloping commercial areas as Land Readjustment Action and Town Redevelopment Action. And we found that in such areas, as a result of its character, this regulation has been used as a assistant of Land Readjustment Action or. Town Redevelopment Action.