The effects of catalysts addition on the carbonization reaction of biomass have been studied in a thermogravimetric analyzer (TGA). The sample biomasses were Bamboo and Pine. The catalysts tested were K, Zn metal compounds. The carbonization reactions were tested in the nonisothermal condition from the room temperature to 850 °C at a heating rate 1~10 °C/min on the flowing of N2 purge gases. Also, the effects of catalyst on the torrefaction were tested in the temperature condition of 220, 250, 280 °C at 30 min. Combustion characteristic for the torrefied catalyst biomass were studied in the nonisothermal conditions of 200~850 °C. As the results, the initial decomposition temperatures of the volatile matters (Ti) and the temperature of maximum reaction rate (Tmax) were decreased with increasing the catalyst amounts in the sample biomass. The char amounts remained after carbonization at 400 °C increased with the catalyst amounts. Therefore catalysts addition can be decreased the energy for carbonization process and improved the heating value of product char. The catalysts reduced the optimum torrefaction conditions from 250 °C to 220 °C. The torrefied catalyst biomass have lower activated energy from 46.5~58.7 kJ/mol to 25.1~27.0 kJ/mol in the nonisothermal combustion reaction.