For the purpose of making orderly and continuous use of land, land use planning adapted to the natural conditions of the land must be of prime importance.
In this paper, we discussed a method of estimating natural resources and then, aimed to establish a readjustment method of land use planning in rural areas.
Taking into consideration of natural land unit classification, the Area Suitability Classification System was improved the include the result of estimation of natural resources and to be effective for larger areas with geographical, geological and biological variety.
In the first chapter, we review previous papers which mentioned land use suitability classification in rural areas and we suggest some problems related to the methodology of estimating the functions of open space.
In the second chapter, we mention the detail of Area Suitability Classification System which includes a natural resources estimation process.
In the final chapter, we illustrate the effectiveness of the method with the case study in Chino City in Nagano Prefecture.