Abstract: This article discusse Oligocene Yaxi lake Formation based on the up data of Wudaoliang area 1:200000 stream sediment surveys.We have got the parametric statistics from original data of elements of stream sediment surveys.Through relative abundance,R type cluster analysis and factor analysis,it analyses the content distribution characteristics of each element and the relationship among elements in strata,it gave a further explanation in strata metallogenesis.It was considered that Yaxi lake Formation had a significant high calcium carbonate rock built environment,and Ba,Sr,Ag,As,Cd,Mo had different degrees of enrichment.Strata have ore-bearing property,among them Ag distributes in silicon sandstone,others in carbonate rock.Under the effect of magma heat source,the main ore-forming elements could enrich further to unusual or formed ore.