Recently, improving on a river has been recognized as not only the necessary measure for flood control and water utilization, but also the method to raise the quality of urban environment. But, in most cases, improvement plans of a river are made without, considering the history of the river and the usual contact with the river by the inhabitants, so that the details of them are alike and often mismatch to the situation around the river. Then we selected the points from upper, middle and lower reaches of the Seno-River in the east of Hiroshima city respectively and conducted the quest,ionaire on inhabitants around these points. The purpose of this questionaire is to obtain the inhabitants' opinions about the Seno-River and their evaluation about the montage pictures of the Seno-River that are the description of 6 improvement plans of a river and presented in the form of a leaflet. As the results, the plan D and F shown as the following F'iqure.2 are more desirable than others. On the other hand, we analysed the relationships between the characteristics of inhabitants about the river by the Quantity Theory Cluster TIE and found the main factors to classify the inhabitants theirway of thinking about. the river, their recognition of the river arid their recreational use in the river. On the basis of these results, we analyzed the effect that these charcteristics have on p reference in the improvement plans by the Quantity Theory Cluster II. Then we found out that the plan D were more prefered than plan F by the inhabitants who attatch importance to flood control and safety.