利用传统GPS-RTK方法量算废弃矿山高陡边坡的土石方量具有一定局限性，且不同方法计算的结果存在差异。为了解各方法优劣，精准计算边坡治理土石挖方量，以矿区内一处高陡边坡为研究对象，基于实景三维模型，分别采用DTM法、方格网法、断面法计算土石方，并对结果进行了对比分析。结果表明，在高程点提取密度大的情况下，DTM法和方格网法精度均可靠，但随着高程点提取密度的降低，方格网法精度迅速降低，DTM法精度缓慢降低；断面法受剖面间距变化的影响较小，计算结果相对稳定。

The traditional GPS-RTK method has some limitations in earthwork calculation, and there are differences in the results calculated by different methods. Taking a high and steep slope in a mine site as the research object, we used the DTM method, grid method and section method to calculate the earthwork based on the real scene 3D model, and compared and analyzed the results. The results show that both DTM method and grid method are accurate and reliable under the case of large extraction density of elevation points. However, as the extraction density of elevation points decreases, the accuracy of grid method decreases rapidly and the accuracy of DTM method decreases slowly. In contrast, the section method is less affected by the change of section spacing, and the calculation results are relatively stable.