The thesis in its theoretical part discusses the rhotics, including the Czech trills, and especially focuses on articulatory, perceptual and acoustic properties of the fricative trill [ř]. Attention is also paid to possible corrections of disorders of pronunciation. In the experimental part the research of the realization of the trill [ř] by non-native speakers of Czech is described. This research mainly deals with differences in articulation, which are produced by the non-native speakers of Czech (specifically the native speakers of German, Polish, Russian and Vietnamese language). Key words: rhotics, trills, devoicing, trilling, foreigner accent, language level.