Plasma-catalytic ammonia production has demonstrated enormous potential, and constructing efficient catalysts to enhance the synergistic effect between plasma and catalysts is currently a challenging research task. This work investigated the plasma-enhanced ammonia synthesis process on a series of supported SBA-15 catalysts (M/SBA-15: M=5Fe, 5Co, 5Ni, 10Ni, and 15Ni). The results demonstrated that Ni exhibited superior capability for ammonia synthesis compared to Fe and Co. The ammonia concentration in plasma catalytic synthesis showed a volcano-shaped curve relationship with the inerease of Ni loading, first inereasing and then deereasing. When the Ni loading was inereased from 5% to 10%, the perfomance of ammonia synthesis improved by 8.0%. However, further increasing the Ni loading to 15% resulted in a perfomance decrease of 3.3%. The discharge characterization of the performance-optimal catalyst (10Ni/SBA-15) selected through activity sereening indicated that under this packing conliguration, the discharge was unifom and stable, with a higher average current value of the current clusters. This promoted the generation of a larger quantity of high-energy electrons and excited-state active particles participating in ammonia synthesis, thereby achieving higher performance in ammonia synthesis. Stability tests indicated that catalyst activity decreased rapidly within the first 180 minutes, followed by a relatively stable phase thereafter, revealing the importance of pore structure in plasma-catalyzed ammonia synthesis reactions. This work achieved a high ammonia concentration of up to 9927 mg/m^3 and an energy yield of 0.88 g/(kW·h) on the 10Ni/SBA-15 catalyst, respectively. Compared to recent advances, this demonstrates strong competitiveness and provides new insights for the design of efficient catalysts in the field of plasma-catalyzed ammonia synthesis.