[Objective] The reductions of runoff and sediment by the soil and water conservation measures in Beijing mentougou district were evaluated in order to provide some references for soil erosion prediction and environmental effects evaluation upon soil and water conservation. [Metheds] The benefits produced by different measures of soil and water conservation on reducing runoff and sediments were analyzed with the data from runoff plots(2005-2009) in the synthetic science demonstration park of soil and water conservation. [Results] There existed significant differences of runoff depth and soil erosion modulus among the runoff plots with different length; The benefits of terrace and tree disk mensure had good effects of soil and water conservation, they reduced runoff about 77.6% and 81.0%, respectively; and reduced sediment about 84.3% and 77.4%, respectively. The biological impacting factors of terrace and tree disk mensure were 0.17 and 0.23, respectively; the engineering factors of corn, soybean and developing pear were 0.97, 0.35 and 0.85, respectively. [Conclusion] As compared with biological measures, the benefits of engineering measures behaved better, and the combined benefits of the two measures would be the best in the study area.