Dimethyl phthalate was catalytic synthesized by added phthalic anhydride and methanol which were heating beforehand to a certain temperature into a series tubes fixed-bed continuous test device which loaded a strong acid cation exchange resin as catalyst. The optimum reaction conditions are： n（methand）/n（phthalie anhydride） eqnal to 2, space velocity is 1 h^-1, reaction pressure is 1 MPa, reaction temperature is 30 ℃, feeding mode is entering under bottom, the catalyst is A45 cation exchange resin in which water content is less than 0.5%, the yield of esferification is over 90%. The mechanical properties of PVC which plasticized by DMP is close to ones plasticized by DOP or DOA.
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