The article devote systematization of representations of the relationship between speech genre and text modality. The article is topical. There is the fragmentation of the study of means and methods of explicating the modality of the official text in the recantive aspect and applied research. The presupposition for the study was the idea that the subject of documentary speech can “discover” itself directly at the level of vocabulary and indirectly through the choice of forms of grammatical categories, namely through means of expressing the text modality.