The idea of Citizen Science in the context of Open Science stems from the implicit recognition of the importance between science and democracy. This connection implies that knowledge is shared among evebody and that science is its institutional form. However, running counter to this idea of democratically shared knowledge is the historical process of institutionalization that has almost always assumed the exclusion of the lay citizen. This is the fundamental tension that historically underlies all the polarities between science and curious and literate citizens, novices and experts, laymen and professionals. Proposal: In the present research we will deal with the possibilities and analysis of participatory science, represented by Civis Portal: Citizen Science Platform, desenvolvida pelo Instituto Brasileiro de Informacao em Ciencia e Tecnologia (Ibict). Methodology: The study presents a qualitative approach, with the use of documental research and with a descriptive character, in order to verify the projects in Citizen Science developed in Brazil. The research includes consulting the website of the Civis platform, in the topic Initiatives, in order to retrieve the registered projects. The next step was to verify the models of citizen participation, defined as contributive, collaborative and co-created and establish a categorization for analysis of the projects from the elements area data collection, social participation, open data and scope. Results: As results of the research, it is understood that most of the projects are collaborative, developed in the area of Biological Sciences, use mobile data collection, encourage social participation, are national in scope, and do not specify the issue of open data within the projects.