Chad's tree-based parks undergo increasing human pressure, leading to the loss of biodiversity and the modification of the ecological landscape. This study was carried out in the Nya division, Far South of Chad. It aimed to analyze the spatial and temporal dynamics of land cover between 1984 and 2016 and to determine the drivers of vegetation degradation. The databases used were made up of 3 Landsat satellite images (MSS de 1984, TM de 2002 et ORLI_TIRS de 2016) and supplemented by field studies. Satellite images were processed using ENVI and ArcGIS software. Interview was used to identify the activities carried out by the local population. In 1984, Nya division consisted of seven types of land cover, the most important of which was tree-based parks (27.17%), followed by gallery forest (23.59%), shrub savannah (16.68%) and herb savannah (14.59%). Gradually tree-based parks and gallery forest disappeared. In 2016, the main types of land cover were herb savannah (35.74%), house and bare soil (33.32%) and shrub savannah (10.04%). Petroleum project, agriculture, overgrazing, population growth, wood collection and bushfires are perceived by local population as main drivers of forest cover change. These results suggest the establishment of an effective sustainable management policy of tree-base parks of Nya division to avoid its total destruction and its biodiversity loss.