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The presence of radon and its progenies in the tunnel directly affects the health of the staff. Effective measures should be taken to lower the concentration of radon and its progenies in the tunnel to reduce their harm to the human body. The article first introduces the investigation results of radon and its progenies in a tunnel, analyzes the monitoring data briefly, and then analyzes the application of ventilation, shielding and adsorption three kinds of methods in the control of tunnel radon, and gives some reasonable advice.