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对水面较宽、河床不稳定、主流和含沙量横向分布有变化的测站，其单断沙关系通常不好。虽然可用多条垂线沙样混合作为单沙，但仍难满足整编要求。从输沙率测验原理出发，分析了影响单断沙关系的主要因素，提出流量加权计算单沙的方法，并详细介绍了制作单断沙关系的步骤。该方法运用于宜昌水文站后，得到了单一稳定的单断沙关系，可满足整编要求，且提高了精度。该方法还具有操作简便，不增加外业测验工作量等特点。
For stations with a wide water surface, unstable riverbed, and changes in the horizontal distribution of the mainstream and sediment concentration, the relationship between single breakage and normalization is usually not good. Although a number of vertical sand samples can be mixed as a single sand, it is still difficult to meet the reorganization requirements. Based on the principle of sediment transport rate test, the paper analyzes the main factors that affect the relationship between single break and sediment discharge, puts forward the method of weighted calculation of single sand flow, and introduces the steps of making single breakage relation in detail. After the method is applied to the Yichang Hydrological Station, a single stable single breakage relationship is obtained, which can meet the reorganization requirements and improve the accuracy. The method also has the advantages of simple operation and no increase in workload of field test.