The subject of the diploma thesis is the evaluation of development of structure of the high-elevation forest. It compares the structure acquired by alpine stand in about 15 years. Research areas are located in the Low Tatras National Park, in the Prašivá mountain range. The results are processed for four permanent research areas: two are in the height zone up to 1300 m a.s.l. and two in the elevation zone 1300–1400 m a.s.l. Selected areas exhibited differently differentiated three-layer structure 15 years ago. Since the areas are unmanaged, on the results we observe the natural change of the stand structure, without significant anthropogenic influence. The results of our analysis represent changes in the structure of the alpine forest. The changes are described by following dendrometric characteristics: tree species, diameter growth, tree density (live, dead standing and dead lying), basal area, growing stock, deadwood volume, tree classification into layers. The difference in structures is quantified by changes in homogenity coefficient and stand density index. The change in species diversity is described relatively and also by the importance value index. Age structure was derived for both altitude zones based on dendrochronological analysis. The results confirm that high-elevation forests with dominant spruce naturally lose differentiated structure. In the stands, height-leveled structures are formed, characterized by a dominant representation of the upper layer formed by trees with a variable age. Correlation between tree diameter and age is low in high-elevation forests, which is also confirmed by the age variation in the layers.