Abstract: Under the conditions similar to industrial ammonia synthesis, the intrinsic kinetics of Series "A" Catalysts (A110, A106) made in China for ammonia synthesis has been investigated. After the experiment data have been correlated by corrective expression of simple Temkin-Pyzhev equation, it is found that this equation is also valid for intrinsic kinetics of Series "A" Catalysts in ammonia synthesis. With the aid of computation of optimum program, we find that it is most desirable to take the value of 0.5 for a in Temkin-Pyzhev equation. The apparent energy of activation has been found to be between 40,000-45,000 kcal/kg-mol. This agrees to the results found by the previous workers. A suitable kinetics equation and kinetics parameters for application to engineering are suggested. By comparative study of kinetic data, the author have verified that the performance of catalyst A110 is better than A106 and those foreign-made commercial catalysts of same type, especially in the lower temperature range.