In order to reveal the process of soil erosion and the characteristics of nitrogen loss on bare slopes under different rainfall intensity, by using artificial rainfall simulation device, we simulated rainfall of three intensities (1 mm/min，1.5 mm/min，and 2 mm/min) and set two processing method (bare land, slope covered with yarn net) to find out the characteristics of surface runoff and nitrogen loss under different rainfall intensity. The results were as follows：（1）Runoff intensity, runoff sediment concentration, and soil erosion rate were positively correlated with rainfall intensity, while soil infiltration rate and rainfall intensity was negatively correlated.（2）Cumulative runoff and sediment yield in the bare ground showed a linear correlation, while in the yarn net covered treatment they showed a power function relation.（3）Nitrogen loss decreased with the duration of rainfall, the amount of nitrogen loss increased with the increase of rainfall intensity, nitrate-nitrogen loss accounted for a higher proportion of total nitrogen than ammonium-nitrogen.（4）Soil erosion and nitrogen loss could be effectively controlled by covering the slope with yarn net，runoff and nitrate nitrogen loss decreased by 60.21% and 56.74% under the 1 mm/min rainfall intensity, respectively; the amount of total nitrogen and ammonium nitrogen loss could be reduced by more than 59% under the 1 mm/min and 1.5 mm/min rainfall intensity; the amount of eroded sediment was decreased by more than 79% under all three rainfall intensities. The results showed that the yarn net coverage could effectively control the amount of soil erosion and nitrogen loss on the care slope of in the engineering construction area, and this research can provide a reference for the prevention and control measures of soil and water loss in engineering construction area.