Abstract: The CO₂ emissions from the massive burning of fossil fuels result in increasingly serious environmental issues, thus the development of mild and in-situ technology routes for CO₂ conversion will contribute to achieving China's "Dual-Carbon" target. In this paper, the CO₂ hydrogenation to CH₃OH by nanosecond pulsed dielectric barrier discharge plasma under catalyst-free conditions are investigated, and the effects of the pulse parameters (pulse width, maximum peak voltage, rising/falling times) on electrical and conversion characteristics as well as the reaction mechanism are focused on. The results show that reactant conversion and product distribution are strongly correlated with electric field variations. The reactants conversion increases with increasing pulse width under the reference condition, reaching the maximum values of 6.8% and 3.1% for CO₂ and H₂, respectively, at a pulse width of 2500 ns. Moreover, the reduction of rising time and falling time facilitates the generation of liquid products. The total liquid selectivity reaches a maximum of 38.4% when the rising time decreases from 500 ns to 100 ns. The maximum CH₃OH selectivity is 31.8% when the falling time decreases from 500 ns to 100 ns. These results provide a reference for optimizing the conversion effect of plasma-driven CO₂ hydrogenation into CH₃OH.