Abstract:The Basin Scale Simulation Model for Soil and Water Resources Management-SWRRB, which includes 198 mathematic equations, was used to simulate water yield, sediment yield and other natural processes in the Lianshui Basin, 579.3 km2 in area in Jiangxi Province, China.A good result was obtained.Successful simulation depends on: (1) dividing the basin into more subareas; (2) elaborately and thoroughly preparing input parameters; (3) fully conducting simulation experiments and adjusting parameters one by one according to the order of magnitude of the influences of input parameters on output parameters, to the optimal effect.More attention was paid to subareas dividing and values assigning to topographical elements, air temperature, rainfall, soil properties and RCN.