With respect to the severe situation of Global Greenhouse Gas (GHG) reduction，CO2 Capture and Storage (CCS) was put forward.CO2 storage in deep saline aquifers is estimated to have the most storage capacity and be the most promising in all storage methods.Based on geology characteristics of China，silicate geology was selected as the CO2 storage stratum.Some problems on mass transfer of supercritical CO2 storing in deep silicate geological stratum were numerically investigated by using software TOUGHREACT.The acidity and basicity，mineral components and captured CO2 were mainly investigated.After injection for 10 years，at the depth of 750 m along the radial direction，the pH value of the saline aquifers increases；the gas saturation (SG) is 1 in the neighboring area of the injection point，and decreases to 0 gradually；the volume fraction of calcite increases and falls back to the original level of the saline aquifer；the variation of the CO2 captured by minerals is similar to that of calcite；the volume fraction of HCO-3 is closely related with CO2 and CO2-3 which increases in the middle area，and falls back to the original level.Conducting simulation research on CO2 storage in deep saline aquifers would be beneficial to understand the CO2 storage mechanism more deeply.