Established in floodplains and river water touched water and terrestrial vegetation composition and structure is strongly provided the physical and scientific action of the water by the water. Medical research is discussing the River floodplain and low water along the floodplain vegetation develops relationships in the Tama River. Thus, in the first-class River floodplain vegetaation and water quality studies and reports. However, less research discussed relationd with goven approved in a small river , River in the floodplain vegetation and distribution of the river water. So research for each basin from the upstream refion of the Sakai River basin of small rivers flowing in the Kanagawa Prefecture in response one of downstream area. We micro-terrain scale consisting of various floodplain vegetation distribution in the river's riparian vegetation landscape analysis. Also we went consisting of various vegetation spread inland river basin scale vegetation landscape structure analysis of group plants a sociogical approach target. Results of this research will help the regeneration and restoration of formation of high water purification power in small rivers in riparian vegetation and micro-landform scale.