The paper presents the study of hydraulic conductivity tests on geosynthetic clay liner using a flexible wall permeameter, considering constant head and constant rate of flow methods. Prior to permeation in the hydraulic conductivity test, the specimen was hydrated and subjected to wet-dry cycles of first, third, and fifth hydrated with hydration solutions of distilled water, 0.0125 M, and 0.125 M CaCl2. The permeation of hydraulic conductivity tests was conducted with distilled water. In addition to hydraulic conductivity tests, the free swell index of bentonite of GCL subjected to various wet-dry cycles hydrated with different hydration solutions was evaluated to assess the hydraulic behavior of GCL. It is found that the hydraulic conductivity of GCL hydrated with 0.0125 M and 0.125 M CaCl2 solution has about one and two orders of magnitude, respectively, higher than that of hydrated with distilled water. The hydraulic conductivity of GCL hydrated with distilled water changed insignificantly with an increase in wet-dry cycles from 1 to 5, while for GCL hydrated with 0.0125 M and 0.125 M CaCl2 solution, it was increased significantly with an increase in wet-dry cycles from 1 to 5. It also found that the free swell index of bentonite decreased with changes of hydration solution from distilled water to 0.125 M CaCl2 solution and an increase in wet-dry cycles.