The Brazilian trade policy and its institutional framework have undergone major changes since the economic opening in 1990. Its administrative structures have been completely rebuilt. These changes have encouraged the politicization and pluralization of the trade policy so that decision making and policy implementation have begun to occur in a new context, characterized by new constraints and demands in a foreign trade environment more complex and competitive. The complexity of the new trade agenda has mobilized bureaucratic actors who had not participated of the developmentist trade policy, demonstrating the increase in its degree of politicization. We analyze the building process of the institutions that conduct the post-economic trade policy liberalization, focusing on the analytical relationships between institutional change and the bureaucratic politics dynamics inside the executive branch. Here we analyze the internal conflict in the executive branch among the different agencies that have competences and interests involved as well as how was taken the Presidential action in terms of its actual degree of involvement in each of these changes. We choose to study the institutions that compose the coordination framework of the Brazilian trade policy. In the first cut, we study the process of extinction of the Carteira de Comércio Exterior do Banco do Brasil (Cacex), the main symbol and synthesis of the developmentist institutional model of industrialization through import substitution in the foreign trade. In a second step, we study the process of formation, reforms and consolidation of the Camex model, adopted in the beginning of Cardoso's government and, after some transformations, consolidated under Lula's government. The research strategy was divided in two distinctive stages, but with mutual interconnections. The first one consisted of the proposition of a theoretical framework that would allow the derivation of the hypothesis used in the empirical research from a critical assessment of what had been produced about the influences and implications of the bureaucratic participation in the political process. In the second one, it was conducted an empirical research in which it was assessed the impact of the bureaucratic politics in the trade policy institutional building. In order to implement the empirical research, the legal devices that changed the institutional 9 apparatus has been surveyed as well as the revealed preferences of actors and perceptions of actors and researchers who have had a participation in decision making processes and, ultimately, other objective analytical tools less sensitive to subjective issues. Finally, from the obtained data, it was pondered that the internal conflict within the Executive Branch was an important variable, although not the sole determinant of the process of institutional building of the Brazilian trade policy after the economic opening, and that the analytical framework has provided fundamental concepts for the analysis and for the explanation of the interactions b...