Abstract: The long-term disposal behavior of HLW glass is a key point in HLW safe disposal process. In this study, the leaching behavior and the corrosion behavior of HLW glass were studied in the scenario of underground water crossing canister. The results show that the leaching concentration of elements increases quickly in initial period and then decreases and becomes stable after 200 days. The effects of temperature on leaching rate are different for different elements. The leaching rate of B and Si increases with temperature while the leaching rate of U and Re decreases. The alteration of glass becomes severer with the increase of temperature, but as the elements in glass enter the underground water by diffusing through the layer, the alter-layer can lower the corrosion rate. The rich silicon environment is beneficial to inhibit the leaching of elements.