Aluminum-doped　zinc　oxide　(AZO)　conductive　powders　have　been　successfully　prepared　by　a　simple　chemical　coprecipitation　method.　The　obtained　powders　with　different　post-calcining　atmospheres　were　characterized　using　X-ray　powder　diffraction　(XRD),　scanning　electron　microscopy　(SEM/EDS),　and　dynamic　light　scattering　(DLS).　The　resistivity-dependent　photocatalytic　activity　was　studied　by　degradation　of　methyl　orange　(MO)　in　aqueous　solution.　The　result　showed　that　photodegradation　of　methyl　orange　dyes　obeyed　the　rule　of　a　pseudo　first-order　kinetics　reaction　and　the　AZO　photocatalytic　activity　was　related　to　the　resistivity　under　different　post-calcining　atmospheres.　(C)　2013　Elsevier　B.V.　All　rights　reserved.