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AgBr microparticles decorated by CuO nanoparticles were prepared by a facile direct precipitation method. The composite exhibited enhanced visible-light-driven photocatalytic performance for methyl orange (MO) degradation, about 4.3 times that of pure AgBr. The phases of CuO and AgBr were demonstrated by X-ray diffraction analysis as well as XPS. The SEM images and the cycle experiment revealed that the stability of AgBr was improved significantly by combining with CuO during visible-light illumination. The pH values and the trapping experiments of active species provided good evidences that p-n heterojunction was formed. The high performance and stability of composite were attributed to the crucial role of inner field in p-CuO/n-AgBr, which may transfer holes out of AgBr. The charge transfer mechanism of CuO/AgBr was proposed and discussed in detail. [ABSTRACT FROM AUTHOR]