Based on the data of the 1:200000 geochemical stream sediment survey, the authors delineated the single element contrast value anomaly by using the method of "subinterval area median contrast filtering" and "outlier contrast filtering" respectively. The overlap contrast value anomalies by the two methods were taken as a new anomaly border to re-delineate single element anomaly and multi-element association anomaly. This study indicates that, by the spatial overlay analysis of contrast value anomalies obtained by the two methods, the overlapped portion can be more effectively identified for the anomaly. According to anomaly characteristics of the concentration elements and regional geological background, It is held that this area has obvious potential mineralization and ore prospects of Au, Ag, Cu, Pb, Zn, Sb, Sn, W, and the prospecting work should focus on hydrothermal Cu polymetallic ore deposit, hydrothermal Pb-Zn ore deposit, hydrothermal Sb ore deposit, granite-type W-Sn ore deposit, porphyry Cu ore deposit and rock gold ore deposit.