Abstract：In order to choose the scientific drilling location, the survey collected Controlled-source Audio frequency Magnetotelluric (CSAMT) data along four E-W orientation profiles and Magnetotelluric (MT) data along two E-W orientation profiles between Tengchong County and Gudong Town in Yunnan Province. The resistivity model for the six profiles were obtained by data preprocessing and 2D inversion. The electrical structure of these profiles is characterized by the existence of two low resistivity layers in the crust of the basin. The shallow layer is stably existent in NS direction with the main part distributed from 300m to 1500m in depth. It consists of the bottom of water-bearing volcanic rocks and the top of granites and granite gravel rocks that form the heat reservoir of the Tengchong basin geothermal resource. The deep layer is a magma pocket serving as heat source, with 12~30 km depth and over 25 km E-W width between Mazhan Town and Qushi Town. The above electrical characteristics provide geophysical basis for the study of magma and volcanic activity in Tenchong volcanic-tectonic belt of Yunnan Province.