Legal communication based on a regulatory act is impossible if the defects in the text of the regulatory act do not allow the addressees of the act to understand its contents uniformly. The addressees of a regulatory act should perceive within certain boundaries formed by the goal of fixing the regulatory position. The fuzziness of such boundaries, the inability to determine them leads to the situation of legal uncertainty. In this work an attempt has been made to formulate the main constitutional requirements to the language of regulatory acts based on an analysis of the nature of regulatory acts as one of the types of legal texts. At the same time, constitutional positions are considered as sources of requirements to the language of regulatory acts.