One step ethoxylation reaction catalyzed by Al-Mg composite oxide is to used to synthesize 2-ethoxyethyl acrylate(EEA) by inserting ethylene oxide(EO) into ethyl acrylate(EA). Influences of catalyst preparation conditions on catalyst activity have been investigated, and the process conditions have been optimized. Surface morphology of catalysts is scanned by scanning electron microscope, and the product is characterized by FTIR. Under the optimal catalysts preparation condiotions and reaction preparations: mole ratio of n(Al3+)/n(Mg2+) 0.8 and calcinations temperature of catalyst 500℃; mole ratio of EA/EO 3:1, reaction temperature 130℃, and amount of catalyst 1.5%,the conversion of EO is 70%,the content of EEA is 57.59%, the the content of DEEA is25.29%, the content of TEEA is 11.54%.