Abstract: The elements of Cu，Co，Ni，Fe，Au，Ag，Pb，Zn，As，Sb，Hg，Mo，W，Sn are tested and analyzed by conducting the 1∶50 000 stream sediment survey in Bawu area of Laos.Firstly，the geochemical characteristics of the elements in the research area are summarized preliminarily.The results show that，the enrichment coefficient and variation coefficient of As，Sb，Hg，Au are higher than others，the geological and geochemical reaction of these elements in research area are strong，the element migration and enrichment phenomenon are obvious，so，As，Sb，Hg，Au are the ore-forming (instructions) elements.Secondly，the test data of the above 14 kinds of elements are conducted on correlation analysis，cluster analysis and factor analysis based on the principle of mathematical statistics so as to deeply describe the affinity-disaffinity relationship and the differentiation trends of the elements in the research area.Finally，according to the geochemical characteristics of the elements，23 comprehensive anomalous areas are selected.Besides that，the 3 most advantageous gold polymetallic prospecting target areas including B.Houaysapeu，Bifo′ai-Mozhongzhao，and Huaikang-Wangle are optimally selected based on analyzing the geological and geochemical characteristics of the main anomaly HS-8，HS-15.The above research results can provide some reference for the further prospecting work in the research area.

Key words: Stream sediment survey, Geochemical characteristics, Comprehensive anomaly, Prospecting target area