Abstract: The two-component soybean meal adhesive was prepared by room temperature compounding method using soybean meal as the main raw material. The effects of the addition of sulfurous acid on the physical properties, curing viscoelasticity of the adhesive and the shear strength of the plywood were analyzed. The structures of the two-component soybean based adhesive that was prepared by the sulfurous acid treatment were characterized by FT-IR. The experimental results show that sulphate can reduce the viscosity of the adhesive system, and when the addition amount of sulfurous acid is 6%, the viscosity and the pH value of the two-component soybean meal adhesive are moderate. FT-IR shows that sulfite can promote protein hydrolysis and expose more active groups.The curing crosslinking degree and the curing viscoelasticity were better in the range of 120-150 ℃. The bonding strength of the three-layer plywood prepared by the two-component soybean based adhesive satisfies the requirement of the national standard for type Ⅰ and type Ⅱ plywood and reaches 1.02 MPa(100 ℃) and 1.24 MPa(63 ℃), respectively.