The aim of this article is to assess the susceptibility of chosen components of Polish political system on centralized personalization of the election to the Sejm. The method applied in this process is the qualitative-quantitative content analysis. The construction of the tool that could objectively measure this influence in any democratic country poses an extremely difficult task. For this reason, the author proposed his own catalog of variables, based on the criterion of the relevance of their impact on the process of personalization. This list includes the following determinants: the position of Prime Minister, the electoral system, competencies and the manner of creating the position of the President, the financing of political parties and the role of the mass media. Out of the above-mentioned variables, especially the Prime Minister’s competences and the election system are the key factors that influence the level of centralized personalization, due to which they were graded higher in the assessment of susceptibility.