Objective To prepare a kind of solvent -free polyurethane adhesives using polyester ( PBA) , IPDI and CO as the main raw materials. Methods The structure and properties of the polyurethane curing film were characterized by FT-IR and TG. The influences of different ratios of silane coupling agent to curing time, adhesion intensity and water resistance were researched. Results The addition of silane coupling agent could speed the curing time and enhance its peel strength and water resistance. However, too much silane coupling agent leads to the layering and separation of the adhesive. Conclusion The addition of silane coupling agent should be controlled within 1% ~ 2% .