A composite geomembrane is an advanced engineered material that combines the waterproofing performance of a geomembrane with the reinforcement, filtration, or separation capabilities of a geotextile, creating a dual-functional solution for demanding civil, environmental, and construction projects. Typically structured as a layered system—common combinations include HDPE composite geomembrane (high-density polyethylene membrane bonded to non-woven/woven geotextile), PVC composite geomembrane, or EPDM composite geomembrane—it integrates the impermeability of geomembranes (preventing liquid/gas leakage) with the mechanical strength of geotextiles (resisting punctures, tears, and soil pressure). This unique composition eliminates the need for separate installation of geomembranes and geotextiles, simplifying construction processes while enhancing overall project reliability. Its key functions include providing superior waterproofing for containment structures (e.g., landfills, reservoirs, and tailings ponds), reinforcing weak soil to support heavy loads (ideal for roadbeds and embankments), filtering water to retain soil particles without clogging, and protecting the impermeable membrane layer from damage caused by sharp rocks or construction activities. Composite geomembranes are widely used in critical applications such as municipal solid waste landfills (preventing groundwater contamination), agricultural water storage tanks (reducing water seepage), coastal reclamation projects (blocking saltwater intrusion), and industrial wastewater treatment facilities (containing hazardous liquids). Unlike single-layer geomaterials, they offer longer service life (resisting UV radiation, chemical corrosion, and temperature fluctuations), lower maintenance costs, and compliance with international standards (e.g., ASTM, GB/T). Whether for environmental protection, water conservation, or infrastructure reinforcement, a high-quality composite geomembrane is a cost-effective, efficient solution for modern engineering projects, ensuring long-term performance and sustainability.