The article is devoted to the Ukrainian diaspora (America, Canada, Europe (Italy, the Czech Republic, Poland, Germany, Moldova), the Transnistrian Moldavian Republic) youth oral speech at the synchronous level, in particular the Ukrainian language pronunciation features. The normativity and historical organic are proved on the poll basis; pronunciation problems and orthoepic deviations are indicated; the vowels mastery orthoepy percentage in a wide local and social representation abroad is determined. The investigation object is the diaspora Ukrainians’ oral speech. The research subject is the orthoepic modern Ukrainian language mastery norms, the vowels orthoepy (initial stressed [i], unstressed [е], [и], [о]) in particular. Аnalysis and synthesis used in the study are as follows induction; deduction; observation; taxonomy (for the orthoepy phenomena classification, in particular words representing the sounds orthoepy); quantitative analysis (to determine the frequency of sticking to standards of orthoepy and the orthoepy standards possession percentage); descriptive method (for a pronunciation norms functioning generalized description in diachrony and synchrony). Special linguistic methods including comparative and historical (to compare orthoepy features in synchrony (modern living pronunciation) and diachrony (reflection in written memos; to study the each demanding norm historical roots)); comparative (to identify the different countries orthoepic picture specifics); linguistic geography method (to determine the orthoepy phenomenon spatial functioning). Thus, the vowels pronunciation norms belong to the weak norms abroad - less than 50% of respondents follow them: pronunciation of unstressed [и] is owned by 45% of respondents, [e] – 41%, [o] - 27%, stressed initial [i] – only 9 %. The mastery vowels orthoepy rate is 27%. The highest possession percentage norm abroad is seen when pronouncing such words as [vеде́лка], [vеиде́лка] (58 %), [vеисна́] (51 %), [vе́ршниек] (50 %). Informants demonstrated the worst norms mastery when pronouncing [пиеру́ка], [пиру́ка] (27 %), [зузу́лʹа] (27 %), [пр ̊оумʼін':а] (19 %), [усʹмʼіха́ јеіцʹ:а] (12%), [і́ин̊ одʹі], [и́н̊одʹ і], [и́ін̊ одʹ і] (9 %). There are deviations due to spelling influence and theoretical knowledge lack when pronouncing unstressed vowels [e], [и], [o] and the initial stressed vowel [i] in specifically suggested words or only the theoretical basis lack. The main reason for the literary vowels pronunciation violations is related to the these norms presentation lack in the school textbooks studied by the respondents.