Anodic oxide films on TA2 commercially pure titanium surface were prepared with sodium tartrate environmental solution by potentiostatic method at the concentrations of 1, 5, 15, 30 and 50 g/L. The microstructure of the films was analyzed by atomic force microscope, the Tafel polarization curves and electrochemical impedance spectra of the samples at low potential of 3.5% NaCl were analyzed by electrochemical workstation, and the influence of microstructure on corrosion resistance wsa discussed. The results show that when the concentration is about 15 g/L, the oxide film has a good micro morphology, broad passivation area, maximum polarization resistance value, smaller passivation current and self corrosion current, is the best process conditions.