In the present work, LaCo1-xRuxO3 perovskites (x = 0, 0.01, and 0.02) were synthesized, and the influences of the partial substitution of Co by Ru on the reducibility and structural properties of LaCoO3 perovskite were investigated by XRD, TPR, XPS, STEM, and XAFS techniques. The results indicate that Ru is incorporated into the LaCoO3 lattice, giving rise to a decrease of mean crystallite size as well as promotion of perovskite reducibility. At 450 degrees C and 1 MPa, LaCo0.98Ru0.02O3 shows an ammonia synthesis rate of 10.5 mmol/(g(NH3).h) and insignificant decline of activity in a run of SO h. On contrast, the ammonia synthesis rate over the Ru/LaCoO3 counterpart prepared by wet impregnation method gradually drops from 8.05 to 7.15 mmol/ (g(NH3).h) Moreover, there is strong synergy between Ru and Co species in LaCo0.98Ru0.02O3, affording enrichment of Ru delta+ clusters and surface Co(2+ )species that are beneficial to N-2 adsorption and activation.