The inhibitive effect of NO_3- on the corrosion behavior of U-0.79wt.%Ti alloy in 0.01 M NaCl solution was studied by electrochemical methods. The experiment results show that NO_3- ions possess inhibitive effect on the corrosion of U-0.79wt.%Ti alloy in the solution containing Cl_- ions, which has a close relationship with the concentration of NO_3-. When the concentration ratio of NO_3- and Cl_- exceeds 0.1, NO_3- could inhibit the appearance of the pitting on U-0.79 wt.%Ti alloy effectively; however, when the ratio is less than 0.1, NO_3- show hardly any inhibitive effect on the corrosion behavior of U-0.79 wt.%Ti alloy. In the viewpoint of electrochemical process, the NO_3- could increase the open circuit potential (OCP) of the alloy and lower the concentration polarization, meanwhile, increase the limited diffusion current density. At the same time, NO_3- could also lower the rate of active anode dissolution, and increase the pitting corrosion potential of U-0.79 wt.%Ti alloy. The surface scratches experiments exhibit that the inhibitive effect of NO_3- may root from that the NO_3- ions have precedence over Cl_- ions in being absorbed at the surface defects, which would inhibit the nucleation of pitting corrosion.