Abstract: In the regional geological survey of six 1∶50,000 sheets of Mobaer, etc., Gansu province, geological characteristics of the regional strata, rocks, structures and metallogenic geological setting were identified; the stratigraphy framework and magmatic evolution sequence were established; and the basic tectonic framework and evolution was summarized. In addition, 24 mineral deposits (occurrences) were discovered, such as the Yushishan large-size Nb-Ta rare metal deposit. Accordingly, the researched area was divided into 4 ore-forming prospects, which provided significant basic geological data for further ore prospecting.