This article is devoted to the study of susceptibility of sheep to bio - and geohelminthes at an altitude of 1200 - 3500 m. The sea in the mountain tracts of Kabardino-Balkaria. It is established that in the tracts of Intsyty, Dzhalpak, home, Dougat, located at an altitude of 1200 - 1500 m. the sheep have the same frequency of occurrence. In the tracts of Intsyty, Dzhalpak, home, Dougat, gastrointestinal helminths of 12 species, with the exception of the species T. skrjabini Kalant., 1928, had a high EI level of47-69%. The tracts Shyki, Bashil, Irikchat, Tyzyl located at an altitude of 1500 - 2000 m.n.u. Sea, sheep folk selection of 5 types of bio -and geohelminthes were found with high incidence (EI = 45-70%); 6 species above the average level of occurrence (EI = 2938%); 13 species with an average level (EI = 13-24%; 2 species with low levels of registration (EI = 6-12%). Sheep national selec tion in the tract Irikchat, Tyzyl, Gil-Su, Ushtulu, Adylsu at an altitude of 2000 - 2500 m, are defined 4 types geohelminthes, they found a higher than average incidence levels (EI = 30-40%); 6 species with an average level of occurrence (ee = 14-26%); 3 species with a weak registration (EI = 7-12%). At an altitude of 2500 - 3000 m in the hole Dykhtau, Zhangugan, Donguz-Orun and Ulla-tau in sheep folk selection highlighted 3 types geohelminthes with an average level of occurrence (EI = 15-27%); 5 species with a weak indicator of EI = 6-11%. The tracts Azau, Cheget, Tau ёzen and Shaurtu at an altitude of 3000 - 3500 m.n.u. Sea, sheep worming national selection was not selected, because at these altitudes, virtually no favorable abiotic conditions for their circadian rhythm.