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Combined technology of SDS-CuO/TiO2 photocatalysis and sequencing batch reactor (SBR) were applied to treating dyestuff wastewater.Photocatalysis was carried out in a spiral up-flow type reactor as pre-treatment.SDS-CuO/TiO2 photocatalyst was prepared by modification of nano-TiO2 using CuO and sodium dodecyl sulfate (SDS).Results show that the SDS-CuO/TiO2photocatalyst contains two kinds of crystals,including TiO2 and CuO.The band gap of this photocatalyst is 1.56 eV,indicating that it can be excited by visible light (λ＜794.87 nm).And characterization also shows that there are alkyl groups on its surface.It takes 40 min to improve the biodegradability of dyestuff wastewater.Five-day biochemical oxygen demand (BODs) and dehydrogenase activity (DHA) of wastewater reach the maximum value when dissolved oxygen is higher than 2.97 mg/L.SBR reactor was used to treat this biodegradability improved wastewater.Chemical oxygen demand (COD) and colority decline to 72 mg/L and 20 times,respectively,when the sludge loading is 0.179 kg(COD)/[kg(MLSS)·d],dissolved oxygen is 4.09 mg/L and aeration time is 10h.