This research aimed at studying the main factors affecting the sustainability of Donor funded projects, in Darfur, with particular emphasis on the Area Development Scheme (ADS) in Umm Kaddada Locality/North Darfur State, as case study. Different Methods were used to collect the related data. These include the Participatory Rapid Appraisal (PRA), observations and interviews with officials in the Central Beneficiaries Organizations using stratified random sample of seven village sanduq societies out of 51 societies. Descriptive and analytical methods were used to analyze the data collected. The results achieved revealed that despite the withdrawal of the foreign assistance, the project existed and performed some activities. Such results are attributed to the approach adopted by the project which promotes the direct involvement of beneficiaries in all project phases. Such results are also attributed to the formation of the mechanism of project sustainability from the previous government counterparts before the cession of the foreign support, with continuous financial support from the State Ministry of Finance. The results achieved also revealed that there was a lack of progress in the implementation of some activities, such as that of the central and grass root beneficiaries organizations and the range and pasture. Such results were attributed to the lack of alternative national support that can cover the void left by the withdrawal of the external support, the discontinuous of supervision for the central and grass root beneficiaries organizations, as well as the absence of effective professional executive management for the central beneficiaries organization.