The Federal Constitution of 1988 ushered in a new political phase within the country and is considered a landmark to the return of Democracy in Brazil, after 24 years of military dictatorship. However, to better understand the constitution, it is imperative to analyze the debates of the Constituent Assembly of 1987-1988, which was the scene of conflicts between Progressivists and Conservatives. In Dispute, themes related to popular sovereignty, constituent power, agrarian reform, and among others. This dissertation proposes an analysis of theses debates related to the constituent power, addressing the topic, not from the perspective of constitutionalism, but from the lessons of Antonio Negri, for whom the constituent power belongs to the people and reflects an ontological force of production of new realities and institutionalities. Therefore this paper will analyze proposals of semi-direct Democracy institutions that encouraged greater popular participation in political decisions and were rejected during the debates of the Constituent Assembly. Staying distant from defending such institutions as the best project, because the only one who can think and decide on the best political institutions is the multitude. This thesis seeks to identify if such exclusions are moments of the thermidor of Negri.