Annualized Agricultural Non Point Source model(AnnA GN PS),a continuo us simulation model at water shed scale,simulates surface water,sediment,nut rients,and pesticides leaving the cells and their transport through watershed.The Daning River water shed is selected as a study case.The characteristics of sediment delivery are studied based on landuse,soil,topographic data,and eight year climatic data from 11 meteorological stations.Averaged annual sediment load is 1.25×10⁶t/a at the Wuxing station,rapidly rises up to 1.81×10⁶t/a at the Dachang station,and reaches 1.95×10⁶t/a at the water shed outlet.Xixi River,one of the biggest tributaries in the Daning River watershed,has the largest volume of water discharge up to 20.97%of the total at the watershed outlet.Dongxi River,the second tributary,has the most sediment load up to 26.88%of the total at the watershed outlet.In addition,the area of left bank in the middle watershed(from Wuxi station to Dachang station)is another large sediment source.The sediment delivery ratio(SDR)of the whole watershed is 0.30 in accordance with published references.Viewed from four main stream stations,i.e.Do ngxi river outlet,Wuxi station,Dachang station,and the watershed outlet,the SDR is positively correlated with the watershed area.However,the relation is not significant in the six tributaries owing to the high variatio ns of drainage area,slope,runoff rainfall facto rs,land use/ land cover,etc.