The Tibetan Plateau has been considered as one of the sensitive ecosystems to suffer from global environmental changes and pollutants inputs. In this study,surface snow,glacial,surface water and seepage water were sampled and analyzed for total mercury (Hg~T) in the Mt. Gongga area,China. The total mercury concentrations in these samples ranged from 1.74 to 17.8 ng·L~(-1). Particle bound mercury predominated the atmospheric mercury inputs. The concentration of Hg~T increased with the increase of altitude,suggesting mercury accumulated bycold trappingin high elevated regions. In addition,Hg~T concentration exhibited a diseasing trend from surface snow, surface river,and to the underground seepage water. This reveals the sedimentation of mercury during runoff transportation occurred. Principal component analysis (PCA) and multiple linear regression (MLR) suggested that atmospheric deposition mainly contributed to the accumulation of Hg~T (163.3%),and sedimentation of Hg during runoff transportation was attributed to the decrease Hg~T (-69.8%). This study suggests sedimentation of Hg with particle is the main source for Hg accumulation in water bodies and soil,and the Tibetan Plateau may present a significant Hg sink in the global Hg cycling.