[Objective] Studying the effect of CO2 leakage during geological storage on non-metallic surface water in order to provide a theoretical basis for the related research. [Methods] By changing the leakage time

leakage rate

and the temperature of carbon dioxide

we studied the impacts on pH value

DO

HCO3- and COD of surface water. [Results] The leakage of CO2 affected pH and DO value greatly

whereas its effects on HCO3- and COD were relatively small. Increasing of leakage rate could accelerate the reaction rate of pH

DO and HCO3-

thereby pH and DO declined faster

and HCO3- increased more quickly. However

temperature rising had the greatest impact on COD content. [Conclusion] It suggests that pH

DO and HCO3-

as their sensitive reaction to CO2

could be used as the surface water monitoring indicators for CO2 geological storage.