Landscape-ecological planning is an unseparable part of landscape ecology. It presents the application of theoretical principles of landscape ecology for the solution of practical problems of ecologically optimum and sustainable development of mankind on the Earth. The need of development of landscape-ecological planning is stressed by growing problems arising from non-observance of natural rules and processes in the development of population and civilization processes. The conception of LANDEP, especially in its applied form, puts to the fore the need of multidisciplinary approach in landscape evaluation as an area where on the bases of natural phenomena and processes the activities of man and society are developed. It is necessary to improve, overspread and systematically classify knowledge and bases of ecological factors that have been utilized in different level and way in territorial planning, in land adjustment and in projection and realization of landscape changes. LANDEP can get the passive landscape protection to active position of prevention when protection is realized in planning and landscape formation as a part of the environment. LANDEP is a widely drafted synthesis of knowledge of potential possibilities of ecologically optimum landscape utilization from the viewpoint of purposeful formation of the conditions for conservation and development of healthy populations of organisms and man and for the development of human society. From methodological viewpoint LANDEP is based on the analysis ecological features, interpretation, synthesis and evaluation of them. The result of LANDEP is the proposal of an ecologically optimum landscape utilization aimed at harmonization of social activities in the landscape with its ecological features in time and space.