The purpose of the paper was to study the stand dynamic and regeneration patterns in the virgin forest Rajhenavski Rog, and to carry out a terrestrial analaysis of the gap. In order to do this, a North-American approach was used.The forest of Rajhenavski Rog measures 51,14 ha; the analysis was carriedout in the north part of Rog (10,16 ha). The research was done in 2006,whereby 87 gaps and 377 gapmakers were found. The majority of the gaps are small-sized. The history of the gaps shows their repeated widening and continuous development. The analysis showed that most of the gaps have 2 to 5 gapmakers, and that the virgin forest is in its beech spreding stage, as the percentage of fir gapmakers is rising. Regeneration is small- scale in cores, where the growing space is used by the beech. The stand dynamics of the gaps cause the occurrence of small-scale heterogeneous stands. Necessary is to work precisely and adjust work on the field. Knowledge of research is in need for transfer into management forests.