Governmental systems can be defined and classified into main and sub groups by institutional and behavioural dynamics. These dynamics, especially political party structures affect the way constitutional systems work This paper aims to classifiy presidential system by using political party structures as an institutional dynamic and also taking other dynamics into account to evaluate unique features created by it. The writer divides presidential systems into three sub groups: one party, two party and pluralist systems. One party system often occurs in Africa, and helps creation of semi democratic or autocratic patronal hyper-presidential regimes. Two party system, also known as the USA type of presidentialism, creates divided governments with high level of democracy but requires equally high levels of political talent to govern as it is difficult and complicated to administer in that divided structure. Finally multiparty presidentialism triggers minority governments or coalitions. This type of coalitional presidentialism works under the influence of political polarisation, political parties' levels of fragmentations and institutionalisation.