Recently, it becomes prosperous as for trial which activates public participation and cooperation for environmental preservation of the river. The purpose of this study is to make obvious some knowledge about the means of activation for improving the residents' interest and the intention of public participation for preservation of the familiar river in the basin. Therefore, the questionnaires was collected in the Sendai river basin and analyzedabout improvement of interest for the familiar river and the intention of public participation to activities. As a result, some new knowledge was made obvious which were the relations of consciousness and action in the basin, the main factors which affect interest, the notes when supply the opportunity for participation, and the others.