A new technology of coupling reaction was studied, which simultaneous synthesis of Poly(ethylene glycol succinate) oligomers and dimethyl carbonate were obtained by coupling reaction of ethylene carbonate and dimethyl succinate over various metal ethyl acetoacetate complexs. Zn(EAA)2 as catalyst has the highest catalysis activity for the coupling reaction. The preferable reaction conditions were follows: reaction temperature 205~215℃, molar ratio of EC to DMSu 4, molar ratio of catalyst to the total mass of EC and DMSu 0.1%, reaction time 1h. under these conditions, the yield of DMC was 52.3%; the intrinsic viscosity [η] of Poly(ethylene glycol succinate) oligomer was 0.1174dl/g.