Based on data observed from the automatic meteorological station near runoff plots and measured soil loss data from field runoff plots at Binxian Experimental Station in 2008

runoff and soil loss from the plots in black soil zone

Northeast of China were simulated.The simulation results were compared with measured values and the applicability of WEPP model was assessed.Results showed that Nash -Sutcliffe model efficiencies of event runoff simulation on different slopes by WEPP were 0.47

0.03

and-5.9

respectively.Nash - Sutcliffe model efficiencies of event soil loss simulation were 0.58

0.72

and 0.60

respectively.It indicated that event simulation result of soil loss was better than event simulation result of run-off.WEPP model was sensitive to the change of slope.Nash - Sutcliffe model efficiencies of event runoff simulation to soybean

Dallis grass

alfalfa

and elm were 0.81

0.71

0.83

and 0.94

whereas Nash-Sut-cliffe model efficiencies of event soil loss simulation were 0.81

0.71

0.83 and 0.94

respectively.This show that simulation results of alfalfa and soybean were better

compared with simulation results of grass and elm and simulation results of bare land on different slopes.From the above results

WEPP can be used to simulate event runoff and soil loss under different soil and water conservation measures and event soil loss at different slope gradients on bare land

but it is not suitable to simulate event runoff at different slope gradients on bare land.