The Yangbajing Geothermal Field is one of non-volcanic high-temperature geothermal fields. The Yangbajing convective system consists of two reservoirs at different depth. The shallow reservoir is constitued of loose alluvium of Quanternary and altered granite of Himalaya. Temperature inside the shallow reservoir is in the range of 150〜165℃ at the depth of 180〜280 m. Shallow thermal water is of sodium chlorite type and mixture of deep hot water and cold groundwater. The deep reservoir is in a slip-fault zone of the core complex. It is a veinor zone-shape reservoir. The deep reservoir can be divided into two parts. The upper parts of temperature 251℃ is at depths ranging from 950m to 1350 m. The lower part is below 1850 m , in which the measured temperature is as high as 329℃ . The deep thermal water is of sodium chlorite type, too. Carbon dioxide-is a major non-condensate gas in the shallow and deep reservoir.