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The article gives information on the ecological analysis of the fauna of the longhorn beetles in the Fergana Valley.There are 81 species and subspecies belonging to the 30 genera of 6 subfamily of longicorn’s in this territory. Of these, 21 (25.9%) species belonging to 13 genera of the subfamilies – Prioninae, Cerambycinae and Lamiinae were recorded for the first time in the Fergana Valley. Of those above, 1 subspecies is considered to be endemic to the fauna of Uzbekistan.14genera (46.7%) of longhorn beetles are monotypic, 7 genera (23.3%) are bitypic, 4 genera(13.3%) are trityptical, 2 genera (6.7%) are tetratypical and 3 genera (10%) are polytypic.
Out of the identified insects, S.minutusP.margelanicum, S.cardinalis, A.sarta, X.namanganensis, T.pilosum, T.bicoloricornis ferganensisare stated to bedominants in the fauna. The identified longhorn beetles feed on 36 species of fruit and ornamental trees and shrubs in the valley. According to the trophical specialization of beetles, polyphages consist of 8 species (9.9%), oligophages – 9 species (11.1%) and monophages– 7 species (8.6%). The abundance of orchards, alleys of ornamental trees and alleys in the Fergana Valley allowslonghorn beetles to constantly multiply and reproduce and spread in different directions massively, stably and randomly.