Abstract: A kind of triazine ring structure hydrolyzed soy protein modified urea-formaldehyde resin adhesive (SPI/MUF) was synthesized from hydrolyzed soy protein, urea, melamine and formaldehyde by solution polymerization reaction. The products were characterized with Fourier transition infrared spectroscopy (FT-IR), thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC) and colloid rheology. FT-IR results showed that biodegradable beans group was accessed with the SPI/MUF successfully. Compared with MUF, the initial decomposition temperature of SPI/MUF was higher, and had a higher thermal stability since residual quality is still 28.84% of SPI/MUF and 22.13%of MUF at 800℃. DSC showed that thermal stability of SPI modified MUF adhesive increased, and its curing temperature decreased. The resin storage modulus (G') obviously increased when ammonium chloride was added, but the loss modulus (G″) obviously decreased. It still had a higher viscosity at 70℃.