Abstract: Ammonia (NH₃) can be synthesized as a nitrogen-rich fertilizer and also a carbon-free energy carrier. The traditional ammonia synthesis process is carried out under high temperatures and high pressures, with a large amount of energy consumption and greenhouse gas emissions. Non-thermal plasma(NTP) can be employed to synthesize ammonia at room temperature and atmospheric pressure, providing a potential and sustainable way to synthesize ammonia. In this paper, the synthesis process of ammonia from N₂ and H₂ driven by nanosecond pulsed dielectric barrier discharge (DBD) was studied. The effects of different pulse parameters, including pulse peak voltage, repetition frequency, pulse rising time, on the volume fraction of synthetic ammonia were investigated. In addition, the effects of gas ratio, discharge gap, and different proportions of Ar on the effect of synthetic ammonia were also explored, and the electrical characteristics and luminescent images of the discharge were analyzed. The results show that the maximum NH₃ volume fraction of 17 600×10^–6 and energy efficiency of 1.61 g/kWh can be acquired at 12 kV, 3 kHz and volume ratio for N₂:H₂ is 2:1. The pulse repetition frequency has a significant effect on ammonia volume fraction, and the volume fraction of ammonia increases with the increase of repetition frequency. As the repetition frequency increases, the number of high-energy electrons per unit of time also increases, and more N₂ and H₂ gas molecules are excited or dissociated, which increases the volume fraction of NH₃.