With the purpose of exploring the quantitative relationship between the features of erosion gullies in the Loess Plateau and the according managing measures, the paper studied on the erosion level and the channel morphology ( opening degree, surface dissected degree and main branch channel coefficient ) of the typical region in Nanxiaohegou watershed and finally put forward the according management measures by adopting the physiognomy geometry ration math model and the analysis method of channel morphology. The results indicate that the channel of Nanxiaohegou watershed can be classified into three grades;the main branch channel condition consists of two types that are branch channel and main channel;there are three types of channel opening degree including semi⁃open, open and deep open types;there are strong, medium and weak separation degrees;among the existing nine kinds of different levels and types'channel combination which can be divided into three grades. The grade one channel is the key area of being managed, which has various channel and erosion types. Whereas, the channel types of the gradeⅡ and gradeⅢ are simple, which only has check dams and backbone dams respectively. Moreover, there is a relationship between channels'types and their levels, which can be analyzed as channel types rapidly reduces as channel level increases.%为探索高塬沟壑区侵蚀沟道特征与治理措施布局之间的数量关系，采用地貌几何定量数学模型和沟道形态特征分析方法，对南小河沟流域沟道级别、沟道形态特征（开析度、地面割裂度和主支沟系数）及其适宜的治沟措施进行了研究。结果表明：南小河沟沟道可分为3级，主支沟状况可分为支沟型和主沟型两种，沟道开析度可分为半开析型、开析型、深切型3种，割裂度有强、中、弱3种，流域内实际存在9种不同级别、不同类型的组合类型。Ⅰ级沟道是治沟措施布设的重点区域，Ⅱ级沟道仅有谷坊分布，Ⅲ级沟道仅有治沟骨干坝分布。
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