  The Jiangmen Underground Neutrino Observatory is a multipurpose neutrino
experiment designed to determine neutrino mass hierarchy and precisely measure
oscillation parameters by detecting reactor neutrinos from the Yangjiang and
Taishan Nuclear Power Plants, observe supernova neutrinos, study the
atmospheric, solar neutrinos and geo-neutrinos, and perform exotic searches,
with a 20-thousand-ton liquid scintillator detector of unprecedented 3\% energy
resolution (at 1 MeV) at 700-meter deep underground. In this proceeding, the
subsystems of the experiment, including the cental detector, the online
scintillator internal radioactivity investigation system, the PMT, the veto
detector, the calibration system and the taishan antineutrino observatory, will
be described. The construction is expected to be completed in 2021.
