The purpose of this study is to present and analyze the changes of basic, and land use on the space of the municipalities Tolmin and Kanal. It is based on the accepted spatial acts, which refer to the changes and completions of the spatial components of the middle-term and long-term social plan for the municipalities, the urban plans and the municipal spatial acts. The study is limited to the period between the years 1982 and 2012. The basic use is made out and analyzed for the entire area of both municipalities, whereas the land use only for town Tolmin with its surroundings and towns Kanal and Deskle with their surroundings. The basic use is represented on the maps in scale 1:75000 and 1:50000 and land use on the maps in scale 1:7500 and 1:17500. Calculations were made for surfaces and their parts of the entire area for all categories of basic and land use. Also differences between the surfaces and comparison of surfaces to the number of inhabitants were calculated. For analyzing results was used number of inhabitants from the years 2002 and 2014. The results show decrease of residential areas and best agricultural lands, but on the other side, increase of precincts of the central activities, activities of production and the green areas.