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In this paper, methyl eleostearate was prepared via the transesterification reaction betweent ung oil and methanol, and then was used to synthesize methyl eleostearate-maleic anh ydride CME-MA) adduct by D-A reaction under UV light. The structure of ME-MA was also identified and characterized by FTIR spectra, UVvis spectra and 1H NMR. Finally, ME-MA adduct was applied to the polyurethane coatings to study the effect of photoinitiator, reactive diluent and ME-MA adduct on the cured films. The experimental results concluded that the optimum formula conditions were as follows: the photoinitiator was TPO, the reactive diluent was HDDA, the amount of TPO was 5% and the addition amount of ME-MA was 20%. The cured film formation possessed good performance, including the highest gel fraction of 96.5%, tensile strength of 11.3 MPa and elongation at break of 23.2%. [ABSTRACT FROM AUTHOR]