The article examines the specifics of the preparation of dialect dictionaries – the goal and purpose, the principles of material selection and presentation. The research carried out shows that a comprehensive dialect dictionary must present the totality of words used in a dialect and reflect the most important distinguishing features of the dialect – phonetic, accentual, morphological, syntactic, semantic and stylistic fields of data. Therefore, when collecting material for a future dictionary, it is necessary to take into account three important things: 1) method of data collection, 2) themes of oral and written texts, 3) principles of compiling a database. Properly selected illustrative sentences of a comprehensive dialectal dictionary ar...