The article focuses on the theoretical and practical aspects of logical-semantic and grammatical-communicative division of the fixed phrase scheme structure. The authors argue that a fixed phrase scheme is dominated by a plan of content over the plan of expression, and therefore generally the gnoseological aspect prevails. The syntactic construction phraseologization expands its possibilities in cognitive and communicative aspects: the number of represented typical objective situations, typical sentence meanings, types of relations, and therefore systems of relations between minimal segments of thought increases. At the same time, the orientation of relations between minimal segments of thought becomes stable, which is due to the limited possibility of a fixed phrase scheme in terms of grammatical variation. The phraseologization degree determines the cognitive and communicative parameters of the fixed phrase scheme: the higher the phraseologization degree, the more significant is the influence of the gnoseological aspect; the lower, the more the influence of the ontological aspect is manifested. The phraseologization phenomenon determines the representation possibility of a wider knowledge format that the fixed phrase scheme possesses in comparison with a free syntactic construction. Thus, in the fixed phrase scheme sphere, there is a different correlation between the linguistic knowledge format and the form of this knowledge representation at the language level. All this allows us to consider the fixed phrase scheme as a particular format of linguistic knowledge.