China fir were liquefied by supercritical fluids technology. The effects of the ratios of solvent to the wood, temperature, pressure and different time on liquefaction rate and molecular characteristics were investigated . The liquefied products and residue were analysed with F-FIR and XRD. The result showed that it was the best liquefaction rate and average molecular weight distribution when the ratio of solvent to wood at 12: 1, the temperature at 270℃, the pressure at 12 MPa and the time at 60min.Results of FTIR and XRD analysis showed tha...