WEPP model was used to simulate sediment load of the bench terrace under different designs. The results showed that sediment load was decreased by 88. 5% ~ 92. 1% after terrace construction,indicating bench terrace with obvious effect on soil and water conservation. The effect of slope angle and ridge height on sediment load,earth volume and arable land area was investigated,the results showed that the slope angle was significantly positive to sediment load and the slope angle was significantly negative to ...