The experimental method and kinetics of the glycolysis of waste PET beverage bottles were studied. Waste PET and propylene glycol(PG) were used as raw materials, and zinc acetate acted as catalyst. During the reaction, samples were collected at regular intervals and stored for determination of hydroxyl values and contents of free glycol later. Three kinetic curves of different formulations were obtained. The results indicate that, glycolytic extent increases with the increasing of content of PG, glycolytic time decreases with the increasing of content of PG; taking consideration of glycolytic extent, glycolytic time and the cost, the mass ratio of PET to PG should be 50.0 to 50.0. Besides, the content of free glycol at the maximal glycolytic extent is agreement with its theoretical value. This result indicates that the experimental method is suitable for study of kinetics of glycolysis and can satisfy the requirement of precision.