Abstract: The kinetics of methane steam catalytic reforming reaction over Z 102 nickel catalyst had been investigated in internal recycle gradientless reactor at atmospheric pressure. Experimental conditions were as follows:reaction temperature range 500-700℃, H2O/CH4=2.5-4.5 (molar ratio), methane space velocities 2000-10000ml/h.g-cat. According to the analysis of experimental results the authors have considered that carbon monoxide and carbon dioxide are formed together in these reaction process, i. e, catalytic steam reforming of methane may be represented by parallel reaction model. The rate equations of carbon monoxide and carbon dioxide formation were obtained respectively. The dependencies of reaction rate constants k1 and k2 on temperature can be fitted in with Arrhenius equation. Some investigators considered that water gas shift reaction equilibrium was very rapidly attained in the catallytic steam reforming of methane process under usual operating conditions. Our calculations of experimental data shows that this opinion is incorrect.