Abstract: In order to understand the dynamic viscoelasticity property of phenol liquefaction products from Chinese fir, this research studied storage modulus E' and loss factor tgδ property at 1Hz, 10Hz, 50Hz and -120~100 ℃ using dynamic mechanical analysis and discussed the effect of liquefaction factors on dynamic viscoelasticity. The results show that a glass transfer temperature (T_g ) occurs in the liquefaction products. An α' relaxation peak exists at the range of 0~50 ℃ and an α″ relaxation peak exists at the range of 50~100 ℃. The activation energy of α″ is much higher than that of α'. Moreover, the activation energy of α' increases with the increasing of liquefaction time, while the activation energy of α″ decreases with the increasing of the mass ratio of phenol to Chinese fir.