People with mental disabilities can exercise byself the existential’s acts of civil  life, including the right to marriage, based on the rules of the brazilian’s Statute of the Person  with Disabilities, based on the persons with disabilities’s international human rights treaty –  New York’s Charter - approved with status of constitutional norm. The treaty determined the  incorporation in the internal legal systems of the signatory countries of cultural and identity  achievements about the Rights of persons with disabilities. Therefore, present a discussion  about it on the legal-dogmatic side, with hypothetical-deductive reasoning, and legaldescriptive and legal-interpretative research.