In order to develop a new way of producing wood-based panels without free formaldehyde emission,the authors studied the technology of using laccase to activate wood fibers.Fibers of liquidambar formasana and laccase were selected,and fiberboard was manufactured under the following conditions:pH 3.0,temperature 30～70 ℃,treatment time for 1,2 and 3 hours,laccase dosage at three levels of 10,20 and 30 U/g fiber.The results showed that the internal bond strength（IB） of fiberboard panels treated with laccase was higher than that of control panels.Laccase treating temperature,time and dosage all had significant influences on IB of the fiberboard.The optimum reactive parameters were pH 3.0,50 ℃,2 h and 20 U/g fibers.