Geosynthetic Clay liner (GCL) is the geosythetic developed in resent years. It is commonly used as the Hydraulic Barrier to decrease the liquid permeation. GCL is now broadly used in Europe and the US. It is applied to all kinds of constructions, such as water channel, pound, reservoir etc. To understand the influence of various clay contains of GCL on the related properties, many qualitative and property tests were done in this study. These tests were focused on Geotextile, Bentonite, and GCL itself,.