Modified starch adhesive was prepared by melamine formaldehyde resin (MF). Modification was characterized by lR at each stage and modification mechanism was verified. X-ray diffraction showed that MF can crosslink amorphous area, but hardly effects on the degree of crystallinity of starch. SEM analysis showed that MF can plasticize starch granules, change surface morphology of starch granules and form network structure by cross-linking. The results showed that the MF improves the water resistance and stability of starch adhesive. At room temperature the modified starch adhesive can keep for 7 days, and its water resistance is 96 h and its viscosity is 500 mPa.s.