The Departments of Borgou and Alibori alone hold approximately 60% of Benin's cattle herd is estimated at 2.166 million heads. The power of these animals is exclusively based on natural pastures, it is important to have an idea of the characteristics of the latter to take decisions. The study took place in the North East part of Benin and aims to characterize the pastures of this region. In total 60 phytosociological surveys were conducted, 40 plots of productivity and 40 linear measurements were made. Surveys were treated with CAP software and identified the types of pasture. Four (04) vegetable grouping were identified. The higher biomass was obstained in the pasture to Ficus glumosa and Hyparrhenia involucrata (5.7 t DM / ha). The biologic spectrum analysis shows an abondance and a predominance of the phanerophytes (55 %) and the therophytes (35%). As for as the phytogeographic kinds are concerned, the species of the soudanian (58 %) element predomines in the groups. The highest pastoral value was observed in the vegetable grouping Cochlospermum tinctorium and Tephrosia pedicellata (32.6). It follows from this study that the study of pastures are degraded environment, have low productivity and low pastoral value. Knowledge of these parameters allows to have an idea of the pressure that undergoes the country.