Fumaropimaric acid was synthesized via D-A reaction of rosin acid and fumaric acid, and was characterized by 13CNMR spectroscopy, electrospray mass spectrometry and infrared spectrum. Then through esterification between FPA and 1,4-butanediol diglycidylether (or 1,6-hexanediol diglycidylether), epoxy prepolymer was prepared. The prepolymer and hardner were blended at different ratio and the coating properties of the cured resins were tested. When the molar ratio of activated hydrogen and epoxy group (n activated hydrogen /n epoxy group) was 1.0 or 1.2, the coating with good properties can be obtained. The experimental results were shown as follows: hardness, more than HB; adhesion testing, less than 2; T-Bend, less than 2T; impact resistance, more than 9.8J; chemical resistance, passed.