The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 ktons liquid scintillator detector with multi-purpose measurements. Due to low background requirement of the experiment, a multi-veto system ,which consists of a water Cherenkov detector and a top tracker detector, for passive shielding and cosmic muon detection is required.In order to keep the water quality good and remove the radon in the water, a ultrapure water system, a radon removal system and radon concentration measurement system have been designed.In this poster, the detail informaton of them have been presented.