  The Jiangmen Underground Neutrino Observatory (JUNO), a 20ktons multi-purpose
underground liquid scintillator detector, was proposed with the determination
of the neutrino mass hierarchy as a primary physics goal. Due to low background
requirement of the experiment, a multi-veto system ,which consists of a water
Cherenkov detector and a top tracker detector, is required. In order to keep
the water quality good and remove the radon in the water, a ultra-pure water
system, a radon removal system and radon concentration measurement system have
been designed. In this paper, the radon removal equipments and its radon
removal limit will be presented.
