In order to simplify the purification process of tung oil-based alcohol for preparation of high-quality tung oil-based polyurethane，the tung oil based polyurethane（TOBP） was prepared through a first transesterification reaction of tung oil and methanol forming tung
oil based fatty acid methyl ester（ME）， which was then esterified（second transestrification） with 1，4-butanediol forming the tung oil based alcohol（TOBA）. It was finally reacted with isophorone diisocyanate to synthesis the tung oil based polyurethane. The structure and properties of the product were characterized by fourier transform infrared spectroscopy（FT-IR）and thermogravimetric analyzer（TGA）. The results showed that the synthesized material was the target product，the content of tung oil based alcohol was increased，and the heat resistance，water resistance，tensile strength and hardness of cured film were improved，but the elongation at break reduced slightly. The prepared tung oil-based polyurethane conformed to the requirements of national standard for general primer used in interior decorative solventborne polyurethane wood coatings.