Nowadays, research on ran-point source pollution which comes from agricultural activities has become ahot-point and diffcult-point issue in the area of enriromnental problem. But currently few researches have been made onnon-point~pollution in trough scale. By using big soil trough and artificial rainfall equipmern to simulate nature precipitation and flow in uncovered sloping field, a physically-based model based.ANSWERS-2000 and,combined submodules of ANSWERS-2000 is developed to study transfer rule of dissolved nutrient(Nitrate-Nitrogen) in the soil trough during single precipitation. The model had been validated three times. Total runoff errors werebetween 4%-15% andCP_Awere between 0. 7-1 2. Accordingly, total Nitrate-Nitrogen errors~between 9%-17% and CP,,~between 0. 6-1. 1. Results showed that the simulation value of runo$ and Nitrate-Nitrogen-centration basically accords with the observed value. The modelbe used to calculate the transporting amount ofNitrate-Nitrogen in trough scale during single precipitation and had some reference values for future research.