Abstract: The Tuolugou cobalt (gold) deposit is one of typical volcanic sedimentary-exhalative deposits occurring in Ordovician-Silurian volcanic-sedimentary rocks in Qinghai Province,discovered in recent years.Through the analysis for the geological background of ore formation and geological characteristics of deposit and adopted the remote sensing technique method,the author summarized characteristics of the source bed,ore-controlling structures and mineralization alterration information in the ETM⁺ images,from the remote sensing angle and according to the distribution of remote sensing anomaly; and considered that the east and west extension areas in the Tuolugou cobalt (gold) deposit and the north wing of the Jiuqigouanticl inorium are better to prospect.