To solve the problem of the activated carbon regeneration online in the process of continuous radon removal, we establish an approach which used activated carbon to reduce radon in air with PSA technology. Through changing the role of the two adsorption and desorption activated carbon beds, the PSA device output the air with low concentration radon continuously. Under the condition of the desorption gas flow ratio is 30%,53%,75%, we measured the concentration of the device output over time. The results show that when the desorption gas flow rat...