In the Belianske Tatry Mts the faunistic-ecological investigation of bush-crickets (Ensifera) and grasshoppers (Caelifera) was performed during 2 vegetation periods (1999-2000). Generally, 16 species were found on the 17 localities (from 760 to 1900 in above sea level). 7 of them are classified to the order Ensifera, and 9 to the order Caclifera. In the species set, common species of the deciduous forests of Euro-Siberian subarea and mountain species prevail. The occurrence of several macropterous or holopterous forms was recorded. On the basis of correspondence analysis (CA) and occurrence of species, three Ensifera and Caclifera assemblages (communities) were defined. The absence of mowing and grazing as well as excessive grazing are the most significant factors negatively affecting structure of these communities.