Hydroxyquinol triacetate was prepared from p-benzoquinone by 1,4-addition reaction with acetic anhydride and then 6,7-dihydroxy coumarin was synthesized from it by hydrolyze and cyclization in concentrated sulfuric acid.Then 6,7-dimethoxy coumarin was synthesized by methylating from 6,7-dihydroxy coumarin with an overall yield of 74.4%.The procedure was practical. Its structure was confirmed by IR and ¹HNMR.