Democratic rule of law and the foundations of the democratic system in the discourse of the Sejm of the 10th termThe June elections in 1989, as a result of which representatives of the then contemporary opposition circles were introduced to the Po-lish parliament, radically changed the Sejm’s political and legal di-scourse. As a consequence of the December Novelization of Decem-ber 29, 1989, that is the amendment to the Constitution of the Polish People’s Republic of July 22, 1952, the principle of a democratic state ruled by law came into force rejecting the provisions on the leading role of the communist party as well as the alliance with the USSR. Undoubtedly, the changes of the second half of 1989 were a conti-nuation of the changes of the first half of 1989, which then resulted in the so -called April Novelization. Importantly, in the first half of 1989, the arrangements made during the Round Table negotiations initiated the transition, and draft amendments to the constitution were developed by the Council of State. In turn, in the second half of 1989 (i.e. after the so -called June elections), before the debate in the Sejm forum and later in the Senate forum took place, proposals for consti-tutional changes were presented in parliamentary texts, which were the subject of a parliamentary initiative. The aim of this thesis is to present the most important Sejm documents containing the then po-stulates relating to radical changes within the constitution. Particular attention should be paid to the issue of the principle of a democratic rule of law underpinning the new political and legal system.