The survey took place in the forest reserve Polšak in Savinja Alps in 2010. The purpose of the study was to quantify successional changes, to identify successional mechanisms of subalpine forests development, and to evaluate pastand current disturbance regimes and based on the evaluation of mortality and recruitment to quantify speed and direction of succession. Recordings from 1982 were repeated at altitudes from 1420 m a. s. l. to 1650 m a. s. l., for four stands- two stands of larch, stand of beech, spruce and larch, and a stand of spruce, larch and fir. In all stands the number of trees decreased (from 5 % to 27 %). Regeneration is dominated by spruce, which saplings were present in three stands while larch saplings were only in one. In all stands a number of trees has decreased (from 16.5 % to 59 %). Overgrowth of the upper layers of trees was marked for spruce and larch, while in the lower layers trees are dying due to lack of light. It is shown by the results that the main factor influencing the development dynamics of the present stands is particularly endogenous mortality as a result of intra-and interspecies competition. Nevertheless, it was not possible to identify significant changes in tree composition, especially in the direction of dominance shade tolerant species. Survey results indicate that the conditions of the last 28 years did not enable rapid change in structure or composition of forest stands.