Abstract: With the example of Ershiyizhan orefield in Tahe County, Heilongjiang Province, this paper adopts element enrichment degree to optimize the soil anomaly. On this basis, the prospecting significance of the anomaly is quantitatively evaluated. With the variety of geological conditions in the orefield, the secondary halo anomalies of elements show a regular distribution, while the enrichment degrees of elements are obviously in regular changes. Therefore, according to the metal contents of surface rocks in geophysical and geochemical anomaly divisions, the element enrichment degrees can be defined. By sorting for absolute and relative degrees of enrichment, the most favorable anomaly for gold prospecting is optimized. With comparison to the anomalies of known deposit, the inferred mineralization possibility may be quantitatively interpreted.