An environmental degradable unsaturated polyester amide resin used in putty is synthesized by molten polymerization and the dihydric alcohol is partly replaced by the urea. Its structure is characterized by FT-IR. The effects of the urea's dosage on the mechanical properties of the putty and the hydrolysis property of the resin are studied. The results show that the resin used in putty has preferable combination property and the hydrolysis property is improved when the dihydric alcohol is partly replaced by proper amount of urea.