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在地质调查的基础上，初步厘定了清江上游ＮＥ向断层束７条区域性活动断层的轨迹结构，并依据断层几何轨迹的间断、连接和重叠特性，划分断层带的相对独立断裂段；进而利用分形分维分析，分别估算活动断层和相对独立断层段的轨迹结构分维值。计算结果表明：每条断层的轨迹结构具有其特征性的分维值，轨迹结构越复杂，分维值越高，咸丰断层分维值最高（Ｄ＝１．２６８），齐岳山断层带分维值最低（Ｄ＝０．９８０）；每个相对独立的断层段也具有特征性的分维值，其中，郁江断层带的Ⅱ段的分维值最高（Ｄ＝１．３１８），齐岳山断层带的Ⅰ段的分维值最低（Ｄ＝０．９６２）；断层轨迹结构越复杂、分段阶区分支断裂越多、分维值越高，其现今活动性越强；活动断层分段分形分析是进行断层活动性评价的有效途径之一。
Based on the geological survey, the trajectory structure of seven regional active faults of the NE-trending fault cluster in the upper reaches of the Qingjiang River was preliminarily determined. Based on the discontinuities, connections and overlapping features of the fault geometry trajectories, the relatively independent fault segments of the fault zone were divided. Fractal and fractal dimension analysis were used to estimate the fractal dimension of the trajectory structure of the active faults and the relative independent faults respectively. The calculated results show that the trajectory structure of each fault has its characteristic fractal dimension. The more complicated the trajectory structure is, the higher the fractal dimension is, the fractal dimension of Xianfeng fault is the highest (D = 1.268) (D = 0.980). Each relatively independent fault segment also has characteristic fractal dimension values. The fractal dimension value of segment Ⅱ of Yujiang fault zone is the highest (D = 1.318) The fractal dimension of section Ⅰ of the belt is the lowest (D = 0.962). The more complicated the trajectory structure is, the more branch fractures are in the staging area, and the higher the fractal dimension, the more active it is now; Analysis is one of the effective ways to evaluate fault activity.