Human remains have been found in six round pits on the site of Reichstett-Mundolsheim ; five of these pits contain inhumations, one of which is dual, dating from the end of the Late Neolithic II. In the last one, eleven bodies burnt altogether, belong to the begining of the Sub Neolithic period. In this paper, the detailed study of the different rituals which have been noticed (burial practices and cremation process) was carried out with archaeo-anthropological methods. Cremation is the earliest evidence for the treatment of the corpses concerning the Sub Neolithic in Alsace, and the practice recognized is radically different from what we meet in the west and south parts of this area. But in other hand, parallels can be found in Eastern Europe.