Abstract: The aerosol pool scrubbing process is an important method to remove the radioactive source term in serious reactor accidents. Based on the aerosol retention process in the rising bubble under the condition of serious accident, a visual single bubble bubbling experiment was designed and constructed. Through this device, the deposition efficiency of aerosol in rising bubbles was studied. It is found that aerosol deposition efficiency is sensitive to the change of bubble size. When the gas flow rate is greater than 0.1 L/min, the bubble equivalent diameter increases rapidly, and the corresponding aerosol deposition efficiency decreases rapidly. The experimental results were compared with the results calculated by the MELCOR model, which shows a good consistency in the overall trend. However, the calculation results significantly underestimate the actual removal ability of liquid to aerosols, which is mainly caused by the irregular shaking of bubbles during the rising process and the fluctuation of gas-liquid interface.