The temperature dependence and catalytic bond-breaking selectivity in the decomposition of ethylene on the stepped Ni (111) surfaces have been systematically investigated using the kinetic Monte Carlo (KMC) simulations. Our simulations indicate that at the low temperature (T < 390 K), the temperature has insignificant influence on the ethylene decomposition on the stepped Ni (111) surface, and the features of the ethylene decomposition are similar to the case of the ethylene decomposition at room-temperature experimentally. The temperature has significant influence on the ethylene decomposition at the high-temperature (T > 390 K), and the carbon coverage on the stepped Ni (111) surface increases dramatically with the temperature increasing. The quantitative performance how the bond-breaking selectivity can be easily controlled by blocking the steps with Ag atoms at various temperatures is provided in our simulations, which are qualitatively in agreement with the recent experiments.