A natural dye aqueous walnut shell extract was obtained by extraction of walnut shell using water at various conditions in this study. Silk fabrics were dyed at various dyeing and mordanting conditions using walnut shell extract and various mordants (Al, Cu, Fe ions). Studies have been made on the effects of dyeing and mordanting conditions on the dyeing properties and fastness (light, water and dry cleaning fastness) of dyed silk Fabric. The results obtained in this study were as follows;. The dye content in the walnut shell extract increased with increasing extraction temperature to 90℃ and extraction time to 120min, and thereafter the dye content decreased a little. The dry cleaning and water fastness of non-mordanted silk fabrics were better than those of mordanted silk fabrics.