GLEAMS (Groundw ater Loading Effects of Agricultural Management Systems) model was introduced to test and validate nit rate leaching in an agricultural catchment in southeast China. Field ex periments were performed under dif ferent landuses such as paddy, bananas and veg etables, in Wuchuan catchment of Fujian Province with the area of 9.6 km². Eight boreholes were drilled and monitoring pipes were installed for continuous monitoring of nitrate leaching from April to December in 2002. The hydrologic and nutrient parameters of GLEAMS model were extracted based on measurement sand experiment s during the main crop grow ing season. Model parameters were tuned to achieve desired agreements betw een measurements and model simulations based on sensitivity analysis.After calibration and validat ion, the model generally had acceptable performances in simulating nitrate leaching throug hout the landuses with an exception in paddy field.The model simulations can be used to specifically establish best management practices for nutrient management and pollution mitigation in the catchment.