Abstract: In order to reduce the pollution produced by polyester wastes and promote resource recycling,the recycled polyester was depolymerized through glycolysis using excessive ethylene glycol in the presence of metal acetate as a catalyst.The glycolysis products were purified and analyzed for hydroxyl and acid values and identified by different techniques,such as differential scanning calorimetry(DSC),infrared absorption spectroscopy(IR) and high performance liquid chromatography(HPLC).It was found that the glycolysis products consist mainly of bis-2-hydroxyethyl terephthalate(BHET) monomer,little dimmer and trimer.The content of purified BHET is 96.378%.