Abstract: In order to scientifically select radon reduction methods for underground facilities, typical radon reduction methods have been sorted out, and the capabilities of each radon reduction method has been evaluated through actual measurements as well as performance tests. The test results show that ventilation is a common technique to reduce radon concentration in underground facilities. With one hour ventilation at 2 m³/s for a 12 000 m³ space, about one third of radon concentration in the underground air can be reduced; While adsorption technique can reduce radon locally in areas where people are concentrated, which can reduce the radon concentration by about 55% in 80 m³ of space after working two hours; And the the sealing technique can significantly reduce radon in areas with high radon exhalation rates, with using of polyimide resin radon prevention materials, the radon resistance efficiency can be increased to more than 99.5%. Therefore, each radon reduction technique has its scope of application, advantages as well as disadvantages, and should be optimized according to the actual situation of underground facility.

Key words: underground facilities, radon, mobile radon reduction, radon-resistant coating