The aim of the study is to describe dialectal phonetic features of Polish language spoken by the students of Polish high schools in Lithuania. The study is based on the research undertaken in the regions with high percentage of the Poles (regions: wilenski, solecznicki, trocki, swiecianski), and the records were done in the years 1998-2000 in official situation during the lessons or half-official in other circumstances. The analysis has shown that distinctive dialectal features are present in Polish language as a result of interference. The dialectal type of pronunciation was most often observed in phonemes 'e', 'o' and 'l'. 'L' was always pronounced in the borderland manner. Most of the respondents has also borderland pronunciation of 'w' after voiceless consonant, voiced 'h', the palatal consonants were only partly palatal etc. The pronunciation of nasal vowels was various. Regional pronunciation of groups: -chy-, -che-, -ij-, -yj- -trz, -dz-, -strz- was relatively rare. Generally standard Polish pronunciation was observed when accent and scope of occurrence of 'o - u' (a continuant of long o) were considered.