The optimization research of suction filtration mold’s midge pore structure of the pulp model was made to improve product suction filtration efficiency and uniformity. The resistance mathematical model of the process of suction filtration mold of pulp molding was established. Through the analysis of the model, it was concluded that the pore size of the slurry and the mutation of the inlet and outlet section were the main factors influencing the pressure loss in the slurry process. Then the simulation software ANSYS/FLOTRAN were applied to simulate and analyze grout hole models with different diameters, tapers and chamfer radius. At last, the experiment was carried out. The optimization parameters of pulp mold suction hole structure were determined as the pore size being 3 mm, tapered bore grout inlet diameter being 3 mm, outlet diameter being 5 mm, grout hole chamfer radius being 1.5 mm respectively.