Abstract: Surface nuclear magnetic resonance (SNMR) can be used to directly find groundwater (brine), and the high-density resistivity method is suitable to distinguish brine from fresh water. This study introduces the joint exploration using the above two geophysical methods in two major salt lake study areas in Tibet-Chagcam Caka and Chalico salt lakes, in order to make full use of the advantages of the two methods while avoiding the limitations and one sidedness of a single method. As a result, the distribution of underground brine in the two salt lakes was identified, thus providing a basis for the overall layout of the exploration and development of potassium ore in brine in the two salt lakes. Furthermore, the joint exploration results of the two geophysical methods were highly consistent with the geological survey results of shallow wells. It can be concluded that the joint application of the above two geophysical methods in Tibet serves as an efficient and accurate exploration mode for the exploration of underground brine.