According to an investigation into abundant data of rare earth elements V, Ce, La obtained during the 1:200, 000 regional stream sediment survey for Zhangla, Songpan and Plngwu sheet areas, this paper holds that these ele ments can play a peculiar role in classification of Au, W and some other ano malies, differentiation of mineralization anomalies of various magmatic rocks, and the study on strata and metallogenic characteristics of different tectonic areas as well as on regional geochemical characteiistics of elements, thus un doubtedly serving as good geochemical indicators. This understanding opens ip a new train of thought for the study of regional geochemical data.