The purpose of this paper is to propose an approach to classify the grass-land of Aso region with AHP. As the criteria of evaluation, "the importance of landscape" and "the difficulty to maintain grass-land" are taken into consideration. In order to verify the feasibility and efficiency of this approach, an experimental classification of gras-land in Aso region is attempted. The case-study confirmed that the method is effective and practical. Furthermore, with the method, a practical application is expected to carry out based on the cooperation with local municipalities.