Abstract: Woody herb residues were used as the raw materials,and K₂CO₃ catalysts with different contents were simply loaded by the impregnation method. The catalytic pyrolysis characteristics and kinetic parameters of herb residues were analyzed by thermogravimetric experiments（TG）,and Starink method was used for kinetic analysis to calculate the apparent activation energy of catalytic pyrolysis reaction. A fixed-bed reactor was used to optimize the catalytic pyrolysis conditions,and the effect of K₂CO₃ loadings on the product distribution of the herb residue pyrolysis was investigated as well. The TG/DTG results of thermogravimetric analysis show that K₂CO₃ could significantly reduce the initial pyrolytic temperature（Ti）and maximum pyrolytic temperature（Tmax）,and greatly reduce the activation energy of the herb catalytic pyrolysis during the rapid weight loss. The greater the K₂CO₃ loading is,the higher efficient the herb catalytic pyrolysis is. The fixed-bed pyrolysis experiments show that K₂CO₃ loading is the most important factor for the catalytic pyrolysis of the herb residues based on the orthogonal analysis. It is proved that K₂CO₃ accelerates the low-temperature depolymerization of biological macromolecules and the catalytic cracking of pyrolysis intermediates. Potassium carbonate not only reduces the yield of pyrolysis oil,but also obviously increases the yield of syngas（H₂,CO）and small molecule low-carbon hydrocarbon gases such as C₂H₆ and C₃H₈,which is conducive to increasing the H₂/CO molar ratio of pyrolysis gas.