This study was conducted to evaluate the applicability of Agricultural Policy/Environmental eXtender(APEX).APEX model was tested and used to compare benefits of different land management measures in three experimental plots in the middle and upland Huaihe river watershed.Simulated average daily runoff and sediment yield were within 20% of observed values

the average Nash-Sutcliffe efficiency coefficient(EF) above 0.6 and average R2 above 0.7 during the calibration period.For the validation period

simulated average daily runoff and sediment yield were within 12% of observed values

APEX model tracked the variability of daily runoff and sediment yield with the average EF above 0.5 and average R2 above 0.7.The long-term benefits of management practice 2(woodland with horizontal-ditch) over the baseline(fallow) were quantified as a 37% surface runoff reduction and 89% sediment yield reduction.Benefits of management practice 1(mixed wood-grass with horizontal-terrace) were slightly less than these of management practice 2.Constructions of horizontal ditch

horizontal terrace and enhancing vegetation are efficient strategies for controlling runoff and sediment in the research area.The results suggested that APEX is a useful tool for evaluating soil and water loss under different management practices in the middle and upland Huaihe river watershed.A new approach was proposed for soil erosion study in the area lacking detailed information.