Abstract: This article explores the question of sources of judicial administrative procedure law of the Russian Federation. Attention is turned to the special role of the Constitution of the Russian Federation among other sources of this branch of law, since its provisions are basic for the development of judicial administrative procedure in modern Russia.  Emphasis is made on the Chapters 2, 3 and 7 of the Constitution of the Russian Federation, the prescriptions of which develop in the Code of Administrative Procedure of the Russian Federation. From the administrative and procedural perspective, the author analyzes the results of the constitutional reform of 2020, which put to the forefront the question on the Constitution as primary source of the Russian public law. The main conclusion the conducted research consists in specification of thesis on the Constitution as a source of judicial administrative procedure law in the provision that the constitutional text views administrative proceedings as equal and sovereign form of legal proceedings alongside other forms, the essence of which lies in hearing administrative cases. At the same time, the Constitution employs the term “administrative procedure legislation” that implies a set of normative legal acts, which serve as the basis for the activity of judicial authorities with regards to hearing administrative cases. The author gives positive assessment to the results of the constitutional reform of 2020, although notice that certain proposals made by the representatives of public legal science were unimplemented by the legislators.