Tengchong volcano-tectonic area located in southeast Tibetan plateau has experienced frequent magmatism. In order to support selecting site and pilot holes for continental scientific drilling, the authors conducted geophysical investigations in the area from Mazhan in Tengchong Basin. Two low-velocity and resistive layers were recognized in the crust within the basin. The resistive layer in the superficial part consists of hydrous (hydrothermal) volcanic rock, granite and glutenite, forming a geothermal reservoir in the basin 300~1 500 m in depth. The deep-seated conductive body is a magma pocket (heat reservoir), lying 12~30 km in depth in Mazhan, Gudong and Qushi. Its EW-trending width exceeds 25 km and may be linked to magma pockets in northern Tengchong.