[Objective] Using unmanned aerial vehicle(UAV) remote sensing monitoring technology to monitor the response of leaked CO₂, in order to provide a theoretical basis for monitoring accident risk of carbon capture and storage(CCS).[Methods] By environmental background value monitoring, experimental monitoring, theoretical simulation and data comparison analysis, the response of UAV remote sensing monitoring platform to the risk assessment of CCS leakage was studied.[Results] The standard deviation of CO₂ concentration change in the environment caused by CO₂ emission that over the highest value of the environmental background of a section, was taken as the response concentration difference. Under the experimental conditions, the UAV was located at a horizontal distance of 10 m and a vertical distance of 9 m from the source of leakage. The response concentration was 502 mg/kg, when the environmental background value was 448 mg/kg. Calculation from Gaussian model showed that the theoretical value of the CO₂ diffusion under the experimental conditions at the experimental location was 40 mg/kg.[Conclusion] The UAV remote sensing monitoring platform can respond to the leaked CO₂ and can be applied to the actual CCS leakage accident risk assessment. As the large amount of leakage under the industrial scale, the UAV remote sensing monitoring platform can provide effective monitoring for large space field.