We present this dissertation as the result of inquiries and reflections obtained from the Strictu Sensu Post-Graduation Program in Social Service of Pontifical Catholic University of Rio de Janeiro. The main theme of this study is the population in a street situation and its insertion in society. The main objective was to understand the historical process of formulating the National Policy for Population in Street Situation, based on the contribution of the Permanent Forum on Adult Population in Street Situation in the State of Rio de Janeiro. We start from the understanding, according to Silva (2009), that this population is particularized by a social and economic phenomenon, caused and intensified, basically, by the contradiction of capital and labor in contemporary society. This, being a latent expression of the social question, being, therefore, the target of social policies, needs public state action in the creation of policies adapted to its confrontation. As the main assumptions made during the research, we visualized the organization and participation of this population, as a social movement, in the requisition and elaboration of a public policy, whose creation was favorable in the Lula government, with the intrinsic support of the Ministry of Social Development, with the organizations involved, highlighting the experiences of São Paulo and Belo Horizonte. The exploratory research, of qualitative character, counted on bibliographical review and field research from the use of semi-structured interviews. The results were generated through the technique of content analysis (BARDIN, 2009), in order to capture the participants explanations to generate inferences. As the main results obtained with this study, we understand that the historical process of construction of the National Policy for Population in Street Situation had as a success the protagonism of the Population in Street situation, in the formulation debates, together with the other involved entities. The national conjuncture, during the Lula administration, allowed the institution of Decree 7.053/2009, bringing a new reading on this subject, forcing the primacy of human rights and creating important instruments for the guarantee of rights, from a bias towards the Intersectoriality of public policies.