The aim of this article is to try to reconstruct the potential changes to the electoral system to the Sejm and the Senate resulting from the announcements of the politicians of the Law and Justice party, as well as to indicate the impact of such changes on the election results based on the data from the 2019 elections. These studies indicate that such changes would lead to a significant strengthening of the party with the largest number of votes, in fact leading to the marginalization of the smallest parliamentary parties. As a result, there would be a far-reaching disproportionality of the choices and a violation of the material aspect of the principle of equality. In addition, an artificial majority would be created that could, under certain circumstances, constitute a constitutional majority despite relatively low public support.