受自然因素和人为因素的共同作用，区域水土流失分布呈现空间异质性。选择济源市作为研究范围，根据区域受人为活动干扰、发生水土流失的容易程度，划分水土流失易发区和水土流失易变区。在易发区和易变区划定的基础上，以异质性最小单元为样本，设定四种抽样方案，研究分析了通过抽样单元监测数据推算区域数据、区域数据推算县域尺度数据的精度和可行性。结果表明，通过抽样单元监测数据推算县域尺度水土流失数据的方法是可行的；基于易变区优化异质性最小单元抽样方案的各类精度、拟合精度均高于其他抽样方案，符合县域尺度水土流失监测的精度要求。

Influenced by natural factors and human factors, the distribution of regional soil and water loss presents spatial heterogeneity. This research chooses Jiyuan city as the research area.According to the area affected by human activities, the occurrence possibility of soil and water loss, the division of soil and water loss-prone areas and soil and water loss-variable areas. Based on the delineation of areas, four sampling schemes are set up to study and analyze the accuracy and feasibility of using the data from the sampling unit to estimate the areas data, and then to calculate the county scale data. The results show that the sampling unit monitoring data calculation method of data at county scale soil erosion is feasible; all kinds of precision, the fitting precision of variable region optimization heterogeneity minimum unit sampling plans were higher than other sampling schemes based on county scale soil erosion monitoring, meet the accuracy requirements.