Abstract: Reducing backstaining of blue jeans by the synergism of laccase and acid cellulase during the biofinishing was experimented.The finding indicated that only adding acid cellulase has achieved a good effect in the dehairing and decolorization of blue jeans during the biofinishing,but results in heavy indigobackstaining.In the presence of laccase,the degree of backstaining can be greatly decreased.The suitable synergistic washing time was(60 min) and when the amount of laccase was(5.0 g/kg)(o.w.f),the backstaining degree was reduced by 83%.The plant scale experiments demonstrated that the synergism of laccase and acid cellulase not only reduced the backstaining and imparted the blue jeans the unique ″snowflake″ effect,but also reduced the amount of indigo blue in wastewater by 80%,which was of great benefit to alleviating environment pollution.