Abstract: The plasticized polyvinyl chloride (PVC-P) geomembrane as the primary impermeable material is applied in membrane faced rockfill dams and pumped storage power stations. Whether its service life under hydrolysis meets the durability during the operation period, we conduct the accelerated aging tests under hydrolysis and axial tensile mechanical property tests to investigate the attenuation of breaking strain using three PVC-P geomembranes. A hydrolysis aging model is constructed by Arrhenius formula, and the service life of geomembrane is analyzed and predicted. The accuracy of the model is verified using test data collected over 180 days at a temperature of 20℃. The research shows that the life cycle of PVC-P geomembrane is related to the temperature of reservoir water, the content of plasticizer and the thickness of membrane material. At 20 ℃, the service cycle of material A is 49.05 years, while that of material B and material C is 153.76 years and 181.30 years respectively.