Abstract: At present, the main methods for large-scale treatment of tritium-containing wastewater include electrolysis, catalytic exchange, low-temperature distillation, and water distillation. Among them, the water distillation method has the advantages of simple operation, non-corrosiveness, no hydrogen production, and no explosion, and has broad application prospects. Currently, the packing used in water distillation separation technology needs to be operated under low-pressure conditions. Studying the hydrodynamic properties of the packing under low-pressure conditions is crucial to the development and modification of the packing. In this study, the hydrodynamic properties of perforated triangular corrugated plate packings were explored based on CFD modeling and numerical simulation methods. SolidWorks software was used for modeling and fluent software was used for simulation, and the RNG k-ε model was selected as the turbulence model. To simulate the low-pressure environment of water distillation and more accurately analyze the hydrodynamic properties of the packing in the low-pressure environment, the effects of perforation aperture and corrugation angle on pressure drop and flow resistance under low-pressure conditions were explored. The proposed CFD model is first validated by comparing the simulation results with experimental data for pressure drop at different inlet gas velocities. The control variable method was used to study the relationship between the F factor and pressure drop and the relationship between the Reynolds number and drag coefficient under different packing geometric structures. The changes in the pressure field and velocity field under different perforation apertures and different corrugation angles were analyzed. The study found that as the flow velocity increases, the pressure drop shows a parabolic upward trend, and the resistance coefficient decreases in the laminar flow region, but the resistance coefficient is almost unchanged in the completely turbulent flow region. As the pressure decreases, the flow velocity shows an increasing trend, and the flow velocity distribution does not change significantly. The increasing trend of the flow velocity becomes less obvious as the pressure decreases, indicating that the influence of pressure on the velocity field weakens. Increasing the perforation aperture reduces the pressure drop, but leads to an increase in the resistance coefficient. As the perforation aperture increases, the flow rate decreases overall and the low flow rate area increases. This is due to the simultaneous change of the void ratio and equivalent diameter of the filler. After increasing the corrugation angle, the gas channel increases, the gas flow resistance decreases, the dry pressure drop and resistance coefficient of the filler decrease, and the velocity field is distributed more uniformly.