Abstract: The suitability evaluation is based on the land use survey in Shiyan area.In the light of the uncultivated hillside fields,major factors concerning physical and social-economic aspects are analysed comprehensively.And then land qualities are matched with the needs of the fixed land uses.Based on this,the four kinds of suitability evaluation,i.e.,suitabilty for cultivation,for forestry,for animal husbandry and for gardening,are completed on computer by using the fuzzy mathematic method.And the suitability for cultivation is discussed in more detail.