In this study, the uniaxial tensile tests were conducted to verify the difference of ductile behavior according to steel ratio of RC member. The tests were conducted on concrete compressive strength of 30MPa and SD400-D19 rebars. The steel ratio was classified with 0.59% and 2.87%. From the evaluation results based on limit state strain, both 0.59% steel ratio and 2.87% steel ratio were confirmed to exhibit more than 5% strain presented in korean highway bridge design code. But in case of 0.59% steel ratio, the decrease of limit state strain and failure strain was remarkably confirmed.