Abstract: With 1 ∶ 200 000 stream sediment survey of copper in northwestern Zhejiang Province as an example, the authors used the content arrangement method to study the internal structural features of Cu geochemical anomalies delineated by the Fractal Summation Method in this area. It is the stability of fractal non?scale section that masks the internal spatial structure of the anomalous field, and the ignored fact therein is that such an internal structure can be manifested by a natural revelation or content arrangement ( of copper from small to large content) of the original anomalous sample data itself, rather than an effort to overcome the stability of non?scale sec?tions. Three lines of L1 , L2 , and L3 are used to fit the hierarchical evolution trends, namely the internal structure, of anomalous data, and therein, L1 specifies the primary anomaly, and L2+L3 specify the advanced anomaly. Studies show that the primary anomaly ( L1 ) may correspond in general to a weak mineralization and essentially barren area, although it does contain some weak mineralization or several hidden ore spots;the secondary one ( L2+L3 ) can be approximately or equally considered as the mineralized anomalous area, between which and the regional tectonomagmatic activity there is a further significant spatial correlation;some new undiscovered copper prospecting target was discovered at last on the basis of the study of the ore?controlling significance of magmatic source, tectonic trans?formation, and convergence of faults in this area.