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复合土工膜以其优良的防渗性能在工程中已广泛应用．目前关注的焦点是它的抗老化性．通过对PVC复合土工膜在不同试验条件下的老化性能研究及和现场运行膜的取样测试对比，分析了环境对老化性能的影响，并初步提出了PVC复合土工膜老化性能的判定方法和进一步改善老化性能的途径：即以伸长率下降为零失去适应变形能力的时间为标准较为合适，而增塑剂品种的优选将是进一步改善其老化性能，延长使用时间的有效途径．
Composite geomembrane with its excellent impermeability in engineering has been widely used. At present the focus of attention is its anti-aging. By analyzing the aging performance of PVC composite geomembrane under different test conditions and comparing with the sampling test of on-site running membrane, the influence of environment on aging performance was analyzed and the judgment method and further improvement of aging performance of PVC composite geomembrane Aging performance of the approach: that is, the elongation to zero to lose the ability to adapt to the deformation of the time as a more appropriate standard, and the plasticizer varieties will be to further improve its aging properties, and extend the use of effective time.