Abstract: During the decommissioning of the nuclear facilities，the high concentration radioactive areosol must be treated to reduce the operator’s irradiation risk． The experiments studied the relationships between the capturing liquid，the capturing liquid dose and the capturing effect for the simulative aerosol． The results indicated that the different capturing reagents had obvious different captuing result． The smaller aerosol particle had the lower volicity of being captured． When the captuing liquid dose was less than 0. 06 kg /m3，it had distinct influence on the result of capturing the simulative aerosol． The radioactive aerosol with241Am and 239Pu generated in cutting the contaminated steel facilities was treated by this method at decommissioning site． The radioactive concentration could be reduced from 136 Bq /m3 to 1. 23 Bq /m3 ． The capturing had a remarkable result．