MgO/ZrO2 solid base catalyst was prepared by co-precipitation method. The effects of hydrolysis temperature, water vapor concentration, total flow rate and calcination temperature of the catalyst on the decomposition rate of dichlorodifluoromethane (CFC-12) were studied. The results showed that the decomposition rate of CFC-12 could reach 98.90% by using MgO/ZrO2 solid base as the catalyst at a hydrolysis temperature of 400 degrees C, a water vapor concentration of 25%, a total flow rate of 5mL/min and a calcination temperature of 700 degrees C. The XRD characterization of the catalyst under different calcination temperature showed that the MgO/ZrO2 catalyst was a solid solution. The products were tested by ion chromatography, SEM and EDS and finding that the decomposition products were main HCl, HF and CO2.