This study is a field survey carried out to evaluate vegetation cover degradation in upper catchments of Waddi Rasyan during the period 28\12\2007 to 24\1\2008. The study relied on several methodologies, most important of which was the field data collection through exploratory and reconnaissance survey, and computer analysis of both maps and image satellite of study region. Results indicated that area of land regions of Waddi Rasyan upper catchment is estimated at about195,065 ha, covering 12 districts with the biggest area for Maqbannah district (about 57195 ha), representing about 29.3 % of the total areas. Regions of study have different plant varieties estimated at about 332 species, belonging to 79 different families at a rate of 2.4 plant species/family. The varietal composition of plants differs from one place to another. The dominant types of varieties composition was grasses and legumes families ( about 6%), while those under Euphorbiaceae family forming about 5.4%. Existing were about 27 different land models, such as houses region (9321 ha), wastewater place ( about 48776 ha.) and bare rock ( about 21049 ha). Plants models were estimated at about 24 with different areas and compositions such as qat and field crop models. The study identified some problems and presented potential suggestions for implantation.

Key Words :Degradation, Evaluation, Vegetation Cover, Waddi Raysean