This research aimed to identify and analyze open textbooks of the discipline of Sociology offered in high school and published in Portuguese language. For this, a bibliographical research was made for better understanding of the concepts related to the open educational resources (OER), open textbooks and examples of repositories. In addition, was also performed a documentary research in National Curriculum Parameters in High School (BRASIL, 2000) and in the book Guide of the Textbook National Program (BRASIL, 2014), in order to get better understanding about the main guidelines of the offer of the discipline of Sociology to the high school. Evaluative criteria already used were adequate from the studies of Oliveira and Abreu (2016). Soon after, was conducted a survey on the Internet to identify repositories of open textbooks and select materials from the discipline of Sociology, whose evaluation occurred by complete reading and identifying the presence or absence of evaluative criteria. It was noticed, that this work covers in part the criteria evaluated, however, are liable to adjustments and improvements. It was therefore concluded that the evaluation criteria of open textbooks considered in this research can contribute to the improvement of these materials, whether in the existing adequacy or assist the authors in the development of new materials for the generation of high quality materials, with a lower cost of production, distribution and use by Education Ministry of Brazil to serve the Textbook National Program.