Using　Bi(NO3)(3)center　dot　5H(2)O　and　NaCl　as　precursors,　ethylene　glycol　and　water　as　solvent,　BiOCl　photocatalysts　were　synthesized　by　sonochemistry　assisted　hydrothermal　or　solvothermal　method.　The　as-synthesized　products　were　characterized　by　N-2　physical　adsorption,　X-ray　diffraction,　scanning　electron　microscopy,　Fourier　translation　infrared　spectroscopy　(FTIR),　UV-Vis　diffuse　reflectance　spectroscopy　(DRS)　and　photoelectrochemical　measurements.　With　phenol　and　methyl　orange　as　the　model　degradation　pollutants　and　mercury　lamp　and　xenon　lamp　as　light　source,　the　effects　of　ultrason　irradiation　time　and　the　V-EG/V-H2O　on　photocatalyst　performance　of　the　BiOCl　were　studied.　Results　indicated　that　BiOCl　synthesized　under　ultrason　irradiation　time　for　60　min　and　with　V-EG/V-H2O　of　1/4　showed　the　excellent　photocatalytic　activity.　With　respect　to　BiOCl　synthesized　by　traditional　precipitation,　3.3　times　increase　over　the　ultrason　fabricated　BiOCl　were　obtained.　The　main　reasons　for　the　enhanced　activity　could　be　that　the　ultrason　irradiation　with　appropriate　time　and　suitable　V-EG/V-H2O　might　benefit　the　increase　in　surface　area　and　surface　-OH　groups,　and　the　decrease　in　crystal　size.　Moreover,　a　high　separation　efficiency　of　photogenerated　electrons　(e(-))　and　hole　(h(+))　was　observed　over　the　ultrason　fabricated　BiOCl.