Abstract: Aromatic hydrocarbons were prepared from Cunninghamia lanceolata under the action of metal modified molecular sieves Pyrolysis and gas chromatography-mass spectrometry were used for pyrolysis.The experimental results show that 5% Zn/HZSM-5 in the modification of single metal reached the best catalytic effect,and the relative peak area of aromatic hydrocarbon reached the highest 34.17%,and the yield of benzene and xylene was the highest.Compared with single metal modification,1% Zn-4% Co/HZSM-5increased the yield of PAHs,so that benzene and toluene were 1.19 times and 1.21 times of the original.The yield of macromolecular aromatics such as naphthalene and methyl naphthalene decreased significantly,as well as the yield of oxides.It is verified that the combination of different metals will produce a certain synergistic effect,and the addition of bimetallic modified molecular sieves in the pyrolysis process is beneficial to the improvement of pyrolysis oil grade.The possible mechanism of the yield change of aromatic hydrocarbons and oxygen-containing organic compounds was described by using NH₃-TPD.