Abstract: The ethyl cellulose maleopimaric acid ester (EC-g-MPA) was synthesized by grafting maleopimaric acid (MPA) onto the cellulose backbone(EC). Then, a series of epoxy resin polymers(EC-g-MPA/ER) were prepared via curing reaction between EC-g-MPA, acting as acid anhydride epoxy resin curing agent, and epoxy resin(ER). FT-IR was carried out to confirm the chemical structure of the products. And non-isothermal DSC was carried out to investigate the curing kinetics of the curing system. The results showed that the FT-IR characteristic absorption peak attributed to anhydride disappeared completely after curing. The activation energy of the curing system was 73.94 kJ/mol, the pre-factor(A) of the curing system was 1.27×10⁶ s^-1, and the reaction order(n) was 0.9, indicating the curing reaction was a complex process. The thermodynamic performance study showed that the glass transition temperature of the product gradually increased with the increase of EC-g-MPA content, and the cured resin also showed excellent thermal stability. Mechanical properties study showed that the mechanical strength of the cured product increased with the increase of EC-g-MPA content, and the epoxy resins with different mechanical properties could be prepared by tuning the content of the curing agent.