1:200000 stream sediment survey shows that Dadongshan area of Guangdong Province is enriched in Sn, W, Bi, Pb, Ag, F and B, which are characterized by uneven distribution and high degree of superimposed enrichment. The delineated composite anomalies are large in size and show quite a few concentration centers. In this paper, Tanling and Chengjia concentration centers were chosen to analyze the anomaly characteristics and geological settings. It is held that these centers have favorable ore-forming conditions and ore-prospecting potential, and hence are suitable places in search for greisen type, altered tectonic belt type, altered rock body type and quartz vein type Sn and W deposits.