Abstract: The leaching behavior of HLW glass by simulated groundwater and deionized water are studied by MCC-1 static method under both atmospheric and anaerobic conditions at 150 ℃ and 90 ℃ for 546 d.The experimental results show that an elevation of temperature can speed up the mass lea-ching rate of the HLW glass,enhance the surface sediment phase formation,and increase its surface thickness.The leaching reaction activation energies calculated for both leaching agents indicate the simulated underground water will cause heavier corrosion to the HLW glass than the deionized water at higher temperature.A leaching mechanistic study for main elements of the HLW glass reveals that the leaching behavior of each main element at lower temperature is approximately the same for both leaching agents,but becomes different at higher temperature.