Starting from Jan. 1, 2006, pursuant to Article 28 of the Natural Environment Conversation Act for development acts with natural Landscape as a subject, the Consultation System on the Effects of Natural Landscape has been put into force in order to, in advance, analyze and predict the effects of natural Landscape according to the implementation of various development plans and development projects and also minimize adverse effects by preparing plans to reduce the effects. The consultation on the effects of natural Landscape is based on the objective and scientific approaches of data with Landscape to minimizing the effects of natural Landscape by developments with the preservation, restoration, outlook and harmonization as basic principles, and looking into the review of natural Landscape damage and harmonization of the site to be developed. For more objectively analyzing the visual effects of natural Landscape according to development acts, the purpose of this study is to provide basic materials of continued Landscape management plans in the planning stage of development plans and after the completion of developments by analyzing the sensitivity of Landscape and deriving areas, whose Landscape will be damaged, mainly focusing on the area of visibility using GIS.