This paper presents the results of study of the vegetation cover in the North Baikal and the Upper Angara basins. The vegetation mapping was carried out in a scale 1 : 200 000 using the field and archive data as well as GIS-technologies. The structure of the map legend was based on the principles of multi-stage vegetation classification developed by V.B. Sochava. The vegetation map shows the basic structural-coenotic diversity of the vegetation cover of the study area. Due to the high disturbance of forest vegetation special attention was paid to structural-dynamic analysis to identify potential plant communities. The rows of transformation were estimated as well. The map provides a possibility to make a prognosis for further vegetation successions under the natural and anthropogenic influences.