We realized a faunistic research of praticol communities beetles (Coleoptera) at meadow study sites region affected to varying degrees by the chemical influence of fly ash 12C. The research areas were represented by four sites located in the extravilan of the village of Rosina (the Rosina tailings pond) and in the extravilan of the village Fackov in the Kocera Valley (Zilina district, Central Slovakia). The etomological material was collected by slipping of herbal layer of the studied grasslands two times during the vegetation period 2021 (from Jun to October). Total recorded insects represented 572 ex. and 44 species belonging to 17 families. At meadow station I (Rosina tailings pond) influenced by the chemical factor of the presence of fly ash, we recorded 261 ex. and 27 spp. of beetles. The beetle community at control station II. of the meadow-forest ecotone in the Kocera valley (Rajecká basin) without chemical influence showed higher abundance and diversity of taxa with 311 ex. and 30 spp. of representatives of the Coleoptera order. The differences in the abundance of individuals and species of beetles in the compared sites are also shown by the graph of seasonal dynamics as well as the indices of ecological stability.