This study presents a morphosyntactic description of the "Matis" language, pertaining to the Pano family. The study is divided into the following sections: a) introduction, in which the author presents a discussion about the importance of research the indigenous languages, how the project in question began, the fundamental theory used and information about the people and the Matis language; b) in this dissertation the author presents the phonological tables based on the work of Spanghero (2000); c) in the third part of our work, the classes of words of Matis are described. The criteria used for describing the classes of words were based on those proposed bySchachter (1985) and Givón (1984); d) in the fourth part, the author focuses on syntax (mainly what is refered to the order of the constituents) and ergativity. [Written in Portuguese]