Based on the materials of thirteen-year investigations carried out in the south of the Republic of Karelia there have been estimated the effects of 15 environmental factors on the territorial distribution of bank vole (Cletrionomis glareolus) in mosaic landscape disturbed by many years' felling. Depending on the phase of population dynamics and season, included set of factors by 40-80% determines the number of bank vole in different habitats. The bank vole prefers forests with birch domination, where it is able to find favorable food and safety conditions. Rocky pine forests and wet relief depressions are avoided by bank voles. The number of bank vole in different years and seasons was estimated on the studied area using GIS-technology.