The southern and eastern Tibetan Plateau is very rich in the Geothermal resource, especailly in Yangbajain. To study the Geothermal in Yangbajain, a wide band magnetotelluric sounding profile, which belongs to the project “the process of the magnetotelluric sounding data in the Tibetan Plateau”, was finished in 2013. The line is from Zhanang to Yangbajain. The line is more than 200KM long and has 36 stations, and it crosses the Indus-Yarlung Zangbo Suture Zone (IYZSZ). The result shows that a large scale highly conductive body exists between the area of Zhanang and Yangbajain, which reaches more than 15KM in depth. It is proved that the highly conductive body suggests that partial melt and/or aqueous fluids are widespread within the Tibetan crust. Generally speaking, the existence of the large highly conductive body has a close relation with the underground thermal state. So we infer that the existence of a huge scale highly conductive body under Yangbajain means the active underground thermal movement which leads to the rich geothermal in Yangbajain.