Genre marker parameter of dialectal speech is discussed based upon the comparative assessment with practice of genre marker linguistic corpuses, and dialect subcorpus of the National Russian language corpus, Saratov Dialect Corpus and Tomsk Dialect Corpus. The problems of representativeness of dialect genres in the corpus and principles of determination of this parameter in texts in Tomsk Dialect Corpus are separated. It is proved that determination of genre limits in the dialect corpus is specific in comparison to the literary language.