The laccase-catalyzed conversion of bisphenol A (BPA) in aqueous solutions was studied in the absence and presence of nonionic surfactant Triton X-100.It was found that the addition of Triton X-100 into the reaction system increased the conversion of BPA especially near the critical micelle concentration (CMC) of Triton X-100.Also it was found that the stability of laccase was greatly improved in the presence of TritonX-100.Studies on the endogenous fluorescence emission of laccase indicated that there existed an interaction between Triton X-100 and laccase,which was beneficial to the folding and stabilization of laccase.The binding of Triton X-100 to the laccase surface also mitigated the inactivation effect caused by the free radicals and polymerization products.Under otherwise identical conditions,a lower dosage of laccase was needed for the higher conversion of BPA in the presence of Triton X-100.