To obtain the information for the planning techniques of improvement of river environment, we carried out the questionnaire surveys around the Seno River in the east area of Hiroshima City. Based on the comparison between results of the surveys before (1985) and after (1994) improvement, we investigated the changes of inhabitant's evaluation for the river environment and their recreational behaviors in the river space. After improvement, people coming to river for walk and rest increased, but people for fishing and playing with water decreased. Also, in 1994, it was pointed out the destruction of nature and water pollution. However, holistic evaluation of the river environment was nearly same between two surveys, and the inhabitants had the opinions that such the improvements were desirable. To clarify the effects of opinions, evaluation and behaviors on satisfaction of the river environment, we analyzed by the Quantity Theory Cluster II. In 1985, inhabitants judged based on the quantity of nature, quality of water, etc. However, in 1994, the scenery effected judgement strongly.
