On the basis of previous work, the authors collected 1 ∶ 200 000 regional geochemical data along the northern margin of Qai⁃dam Basin,used fractal ( multifractal) method to determine geochemical anomaly characteristics in Gobi desert area of eolian sand, and adopted the C⁃A and S⁃A model to investigate the characteristics of geochemical anomaly of Au element influenced by eolian sand in the Gobi desert area. The results show that C⁃A model has advantages in determining the threshold but still has some limitations. S⁃A model can well eliminate the background field and interference factors, reduce the area of anomaly, and can make prominent the small weak anomaly. The method of extracting the region of anomalous elements can be used to identify the vast majority of known ore deposits and indicate the further anomal anomaly area of ore⁃forming elements based on the geochemical data, thus providing a reference for further exploration.%通过搜集柴北缘1∶20万区域地球化学数据，运用分形（多重分形）方法来确定荒漠戈壁景观区受风成沙影响的地球化学异常特征，并利用C⁃A和S⁃A模型分别探讨了景观地区Au的地球化学异常特征。研究表明，C⁃A模型在确定异常下限时有优势，但也存在局限性；S⁃A模型能够很好地排除背景场和干扰因素，缩小异常面积，突出弱小异常。基于该方法提取的异常元素区域能够较好地识别出绝大多数已知矿床，同时指示了值得作进一步异常查证的空白成矿元素异常区域，为勘查工作提供参考，值得开展下一步的找矿工作。
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