中文摘要：

地面坡度是最重要的地形定量指标之一，建立科学合理的地面坡度分级体系对坡度进行科学研究具有重要的意义。总结了近些年在坡度分级研究方面的已有成果，利用高精度1：10000DEM数据为信息源，提取了不同分级的坡谱，研究了不同分级方法及等差分级的不同级差对地面坡谱的影响。结果表明：不同的坡度分级法可以获得不同的地面坡谱表达；自定义分级法得到的坡谱对具体的应用有实际指导意义，模式分级法可以更好地表达地表形态；3°等差分级的坡谱在实际研究中更具适用性。

英文摘要：

Slope is one of the most important topographic variables, it is important to establish a scientific and reasonable slope classification system for slope research. After a comprehensive summary to the previous works in this field, taking 1：10 000 scaled DEM as information source, different classified slope spectrum was extracted, different classified methods and the influence of different ranks of slope classification on slope spectrum were studied. The result shows that different slope classification methods can get different slope spectrums. Self-defined classification method has a practical guiding significance. Mode classification method can express the surface morphology better. The slope spectrum of 3°equal interval classification is more practical.