The article deals with the question of legislative regulation of the practice of embedding the mechanism of the control power in the competence of the legislature. The author reveals the content of the term "Parliament", determines the balance between the concepts of "parliamentary power," "control power," and "representative power." When analyzing the Law "On parliamentary control," the author reveals an imbalance in jurisdictions of the chambers of the Federal Parliament. Federal law sets a non-exhaustive list of control functions of the legislative (representative) bodies in the constituent entities of the Russian Federation. Therefore, regional parliaments extend control powers by means of their own legislation. The practice of legislative regulation of the control activities of the legislative (representative) bodies of constituent entities of the Russian Federation poses problems of control function conformity. The problems of understanding the essence of parliamentary control require the constituent entities of the Russian Federation to adopt legislation determining the forms of control that in fact are not forms of control. Legislative regulation of the parliamentary control and the activity of parliaments in the constituent entities of the Russian Federation that corresponds to the control function do not meet the requirements of the control function of the Parliament as a part of the system of government. The author concludes that it is necessary to establish a uniform procedure for defining the limits of control activity of Parliament in practice.