My diploma thesis is dealing with the structure, production ratio and regeneration process of beech primeval forest in NPR Roštún. The result of it is the evaluation of two permanent research plots (PRP 1, PRP 2) which are representing two stages, growth stage and breakdown stage. During the height and thickness structural analysis was confirmed high correlation between height and thickness of these in both PRP. The thickness structural analysis confirmed a two-peak course. The amount of trees at PRP 1 reached the value 238 pc.ha-1 and at PRP 2 reached the amount of 412 pc.ha-1. The average volume of coarse was found at the level of 431,8 m3.ha-1. The average value of the circular base was at the level of 32,96 m2.ha-1. From the usage of available production space point of view were found higher values in the stage of growth – 21,89 %. The usage of available production space reached the level of 14,79 % at breakdown stage. Higher value of necromass was found at PRP 2. In case of standing dead wood the first degree of breakdown was dominantly represented in both PRP. In case of lying dead wood the third degree of breakdown was dominantly represented in both PRP. High ecological stability of the forest was confirmed for the sake of absence of lying necromass in first and second degree in PRP 2. In the both PRP areas was found negative development for recovery – due to impact of animal. Trees species was recorded at the height classes 0-20 cm and 21-50 cm. The tree species which were dominantly represented were european beech, european ash, sycamore maple. The amount of natural regeneration at PRP 1 was represented at level of 22 300 pc.ha-1 and the amount at PRP 2 was represented at level of 25 600 pc.ha-1. The beech primeval forest Roštún has a high ecological stability despite of the extreme ecological conditions.