By using graft and mineralization method,the nanosized titania prepared by sol-gel method was anchored on the polystyrene microsphere surface,then the photocatalyst modified by conductive polyaniline was prepared.The crystal phase,grain size and morphology of the prepared powders were characterized by XRD and SEM.Three industrial wastewater with CN- was degradated with the modified photocatalyst sample under sunlight.The result indicateds that most CN- in industrial wastewater is degradated,the remainder of which being below national emission standard.