[Objective] Assessments of soil and water loss and the benefit evaluation of measures caused by rainstorm were carried out, the soil erosion caused by rainstorm were analyzed, and the benefit of terrace measures were evaluated, in order to provide effective supplement for the dynamic monitoring of soil and water loss.[Methods] Based on the daily rainfall data and the results of the national dynamic monitoring of soil and water loss project, the Qingcheng County and Qiugou small watershed of the rainstorm center in Gansu Province were taken as the research areas. Based on the rainfall erosivity of the rainstorm, the improved CSLE model was used to calculate the soil erosion modulus. The relationship between the rainfall erosivity of the rainstorm and the annual rainfall erosivity under the condition of multi-annual average rainfall was analyzed. The spatial distribution of soil erosion intensity grades of different land use types under the condition of rainstorm was analyzed, and the influence of terraces on regional soil erosion was discussed.[Results] The rainfall erosivity generated by this rainstorm in Qingcheng County reached 1.85 times of the annual rainfall erosivity under the condition of multi-year average rainfall, and the rainfall erosivity of the rainstorm center reached 4.88 times of the annual rainfall erosivity under the condition of multi-year average rainfall. The area of soil erosion above the strong level caused by rainstorm is 3.46 times that of the soil erosion above the strong level in 2021, and the rainstorm center is 6.93 times. The strong soil erosion caused by the heavy rainstorm was mainly distributed in dry land, grassland and shrub land. The current terrace area in Qingcheng County is 325km2.Compared with the situation without terrace measures, the amount of soil erosion in the county has decreased by 72.87 %.[Conclusion] Strengthening soil and water conservation work such as returning farmland to forest and grassland, comprehensive improvement of slope farmland, and construction of dry terraces is an effective means to prevent and control soil and water loss disasters under heavy rainstorm conditions.