Geochemical anomaly minimum is a key part in exploration geochemistry applied to mineral exploration. The traditional calculation method of geochemical anomaly minimum is based on the geochemical element content data obey normal or lognormal distribution as a precondition. And the elements of this paper, the total multifractal calculation of abnormal minimum, is based on the geochemical variables obey fractal and multi-fractal distribution theory and method. The author uses the geochemical data of a measured area in Hainan for example. The exposing situation of geochemical anomaly of the trenching and shallow wells of this district indicates that the element contents-the total fractal method to attempt to determine the geochemical anomaly minimum is successful and effective.