FE analyses have been performed to characterize triaxiality of Eco-Al7021-T6, one of representative environmentally-friendly materials with lightweight effect, in this study. Also, a novel shape specimen with double notched and a central hole, i.e., DNC specimen, was suggested to obtain two different values of triaxiality from one trial simultaneously. Tensile tests for the standard type specimen were conducted and true stress-true strain relationship, as well as force-displacement curve were obtained. It was revealed that two different values of triaxiality were successfully achieved from the novel DNC specimen, and the number of tests for triaxiality can be reduced with the use of the DNC specimen.