Abstract: Catalytic hydrolyzation of ethylene carbonate (EC) with NY-2 catalyst was studied，which was the second step of the two-step process for ethylene glycol (EG). The optimal conditions were as follows：temperature 160－180 ℃，mole ratio of H2O to EC 2.0－4.0，NY-2 catalyst mass fraction about 2.0%，reaction pressure 3.0－4.0 MPa. Under the above conditions，when there was EG (EG/EC molar ratio 0.5－1.0) in the raw material，conversion of EC and selectivity to EG can still reach 100% and above 98%，respectively.