The Diploma Thesis deals with analyses of high-rise and thicknesses structure of the Black alder and its indigenous cover in south part of Kremnica Mountains, located at University Forest Entreprise TU in Zvolen. In the indigenous area of the researched taxon was placed 5 permanent researched surfaces (TVP), every consists of 0,25 ha.Each one of TVP have had qualificated values of basic covers quantity. The covers on researched TVP have been observed by variation coeficient and the results have shown that the covers are vertically equalized. The analyses of thicknesses structure has pointed out to the slight thicknesses diferentiation of researched covers with mostly single-peaked, symetrical polygons of the thickness quantity.