Abstract: The no gradient behavior of the internal recycled reactor was well proved in the chosen experimental conditions. Then, the apparent kinetics of methanol synthesis was investigated over domestic new catalyst NC309 with the size of 0.154—0.198 mm, under a space velocity of 4 000 h-1, at a temperature from 190 ℃ to 250 ℃ and a pressure between 5 MPa and 8 MPa. The LangmuirHinshelwood type kinetics equation was chosen to set up the apparent kinetics model of methanol synthesis in terms of the reactant fugacity in the hydrogenation of carbon monoxide and carbon dioxide. The parameters were obtained based on the experimental data with the reasonable and effective parameter estimation method. At last, the results obtained were compared with those estimated by the intrinsic kinetics models of methanol synthesis over the same kind of catalyst, and the apparent reaction activation energy of hydrogenation of carbon monoxide and carbon dioxide were both smaller than those of the intrinsic reactions.