BiOBr　nanoplates　with　high　crystallinity　were　first　synthesized.　Then,　Pd　nanoparticles　with　different　contents　were　deposited　over　BiOBr　via　photochemical　vapor　deposition　(PCVD)　method.　The　prepared　products　were　characterized　by　N2-physical　adsorption-desorption,　X-ray　diffraction　(XRD),　transmission　electron　microscopy　(TEM),　X-ray　photoelectron　spectroscopy　(XPS),　photoluminescence　emission　(PL)　spectroscopy,　and　UV-Vis　diffuse　reflectance　spectroscopy　(DRS).　The　effects　of　Pd　concentration　on　light　absorption　and　photocatalytic　activity　of　BiOBr　in　degradation　of　acid　orange　II　were　evaluated　under　both　UV　light　(λ　=　254　nm)　and　visible　light　irradiation.　The　N2-physical　adsorption　test　shows　that　the　presence　of　Pd　nanoparticles　could　not　obviously　change　the　specific　surface　area　of　the　catalyst.　The　UV-Vis　DRS　results　indicate　that　Pd　nanoparticles　could　slightly　shift　the　light　absorption　edge　of　BiOBr　to　long　wavelength　direction.　PL　spectra　suggested　that　Pd　could　suppress　the　recombination　of　photogenerated　hole-electron　pairs.　Under　UV　light　irradiation,　Pd　0.5%　(mass　fraction)　with　loading　can　increase　the　photocatalytic　activity　of　BiOBr　by　60%,　while　under　visible　light　irradiation,　4%　is　found　to　be　the　optimum　content　of　Pd,　which　results　in　an　increase　of　50%　in　photocatalytic　activity.