Beechwood are one of the most wide-spread forest communities in Slovakia and they create a whole array of phytocoenosis. The core of the study was the prevalence of beechwood in the Horna Suca region and the main aim of the work was to interpret its phytocoenological and ecological characteristics. In our work we followed the Zürich-Montpellier methodology and we have recorded 30 phytocoenological entries in the studied area. After the assessment we sorted the received records into the Fagion alliance and Eu-Fagenion sub-alliance which involves beech and blossomy woodland in Slovakia. There were three beechwood associations that we committed to: Asperulo-Fagetum Souggnez et Thill 1959, Dentario bulbiferae-Fagetum (Zlatnik 1935) Hartmann 1953 and Carici pilosae-Fagetum Oberdorfer 1957. The studied communities were distinguished by very much alike floristic composition and they alternated in mosaic patterns in the studied region. The most prevalent association was the Dentario bulbiferae-Fagetum (Zlatnik 1935) Hartmann 1953. The ecological analysis was performed according to ELLENBERG et al. (1992) and we found out that that there were only tiny differences among the analyzed associations with regards to the ecological requirements.