Hydroxylated　polyhalodiphenyl　ethers　(HO-PXDEs)　have　attracted　considerable　scientific　interest　as　examples　of　emerging　aquatic　pollutants.　However,　a　comprehensive　assessment　of　disposal　methods　for　this　particular　pollutant　was　seldom　investigated.　This　study　examined　the　UV　light　degradation　of　HO-PXDEs,　using　2＇-HO-2,　3＇,　4,　5＇　tetrabromodiphenyl　ether　(2＇-HO-BDE-68)　as　a　case　study.　The　results　showed　that　UV　light　was　superior　to　visible　light　and　electron　beam　irradiation　for　producing　a　high　degradation　rate　of　2＇-HO-BDE-68.　At　low　concentrations　of　HO-BDE,　the　degradation　rate　was　not　obviously　improved　with　decreasing　initial　concentration.　The　degradation　efficiency　was　also　found　to　be　better　in　alkaline　solutions.　In　a　UV/H2O2　system,　the　hydroxyl　radical　provided　by　H2O2　was　shown　to　enhance　the　degradation　efficiency.　The　main　photolysis　products　of　2＇-HO-BDE-　68　were　identified,　and　the　possible　photodegradation　pathways　were　proposed.　1,　3,　8-Tribromodibenzo-p-dioxin　was　one　of　the　photoproducts,　which　indicates　that　secondary　pollution　must　also　be　considered　with　the　UV　photolysis　process.