Abstract: In order to solve the problem that a lot of aerosols and soot come from radioactive structure disintegration and cutting during decommissioning of nuclear facilities,our team developed a new type device which would purify the radioactive aerosols and the soot simultaneously.The concept design of the device is based on the universal aerosol purification device.Firstly,a smoke preprocess module is developed based on the mechanical filtration and multi-stage filtration principle.Secondly,the purification process and the overall structure are optimized.The performance test and engineering application show that:the smoke preprocessing module of this device can fully filtrate the fine metal particles or air suspension coming from the radioactive structure disintegration and cutting.As a result,the device is able to purify radioactive aerosols and dust simultaneously and the size of dust particles in its exhaust air is not more than 0.3 μm,and its purification efficiency is more than 85%.