. It is nearly well known that ever increasing process of population growth and industrialization have led to higher levels of water consumption in industrial, agricultural, and sanitary sections, followed by umerous efforts to realization of the most efficient, cost-effective and eco-friendly sustainable management for environmental protection and water resources. Water resources management includes improving water-consuming methods, prevention of water loss and prevention of contamination of under-ground water. In many cases water loss is the result of unsuitable sealing. Using geosynthetic clay liners is one of the sealing method which is widely used in water channels, reservoirs, dams and landfills. Although GCL is now widely used in developed countries, there are still some deficiencies in its performance. One of these deficiencies is its permeability. Althought the GCL has a very low hydraulic conductivity, it is not impermeable like geomembranes. The other deficiency in GCL application is its long-term performance. Many studies have shown that GCL does not show enough durability against weathering condition and in many cases weathering conditions lead to a reduce in its efficiency. So improving GCL quality in case of permeability and durability can be very effective in its sealing performance, prevention of water loss, maintaining the health of under-ground water and landfill surrounding soil. In this study it is tried to improve the permeability and durability of GCL using relatively new materials. For this purpose, nano-clay is used in order to improve the permeability of GCL and sodium poly-acrylate (superabsorbent polymer) is used in order to improve its durability against wet/dry cycles. In this study nano-clay is used in the amounts of 10%, 15% and 20% by the weight of bentonite and the partial replacement percentages of bentonite with SAP (superabsorbent polymer) are set to 3%, 5% and 7% (by the weight of bentonite). In order to investigate the effects of nano-clay and SAP on the hydraulic performance and durability of GCL, five tests including Atterberg limits, free swell index, permeability, self-healing capacity and wet/dry cycles were performed. The results showed that using nano-clay up to 15% (by the bentonite weight) weight considerably improves the sealing performance and self-healing capacity of GCL. Sodium poly-acrylate inclusion has positive effects on permeability and self-healing capacity. Also sodium poly-acrylate considerably improves the wet/dry durability of GCL. In order to improve both hydraulic performance and wet/dry durability simultaneously some specimens containing both nano-clay particles and superabsorbent polymer were fabricated and tested. The results of specimens on this kind of GCL showed that the GCL containing 15% nano-clay incorporating 5% sodium poly-acrylate has a good performance in case of hydraulic conductivity, self-healing capacity and wet/dry durability.