Abstract: Alkyd resins were prepared from maleopimaric acid(MPA)which consists of maleic and rosin instead of phthalic anhydride.Effects of synthesis technology on the properties of coating film of the alkyd resin were discussed.The experimental results show that the reaction time can be shortened by non alcoholysis technology.The structure and molecular weight of the alkyd resins have been characterized by FTIR and GPC,and it was found that the molecular weight of alkyd resin from MPA are higher than that from phthalic anhydride.Film properties of alkyd resins have been compared.It was observed that films of alkyd resin from malepimaric acid are better in drying character,hardness and water resistance than those of the alkyd resin from phthalic anhydride.