Political parties in a democratic society actually play the role of facilitating the mobilization of various ideologies. It is inherently merely in the service of the interests of the few, and in the long run even undermines the principle of sovereignty and democracy. Therefore, in a free society, political parties should have the opportunity to work so that different individuals and groups can participate in political life through legal channels and peacefully away from violence. In other words, the parties have the role of guiding the society and making it possible for the members of the society to find themselves and their arrangement in the mirror of the parties with different views and to support their favorite party. In societies where politics can be defined and shared on the basis of ideology only through the channels of political parties, parties can be considered, in a sense, the gatekeepers of democratic values, because parties are in fact the first filter for separating the right people to enter politics. And naturally, the internal elements of a party try to introduce trained and qualified people from its address to compete in the political arena. This study aims to investigate the role and position of parties in the development of democracy in third world countries (case study: Iran and Saudi Arabia) in a descriptive-analytical method and the use of library resources.