Alpine ecosystems are among the most sensitive to environmental changes because of their narrow habitat specificity. Species are often threatened due to climate change or abandonment of traditional grazing. In 2016 - 2019, we resampled 98 historical phytocoenological relevés from 1970 - 1977. We used relative change of frequency to evaluate a shift in a species composition. In the course of 39 - 49 years, we observed remarkable loss of plant species. Historical data include 190, while recent data include 153 species. In the 1970s, 47 species with varying Red list categories were recorded, over time this number decreased to 35. Most significant is a decline of threatened species of rocks, mylonites and summit areas. The frequency of endemic species dropped from 57,1 % to 32,7 %. Changing environment during last decades posses a great impact on the alpine vegetation. Further monitoring is necessary to predict development of threatened and endemic plant populations.