Abstract: Objective: To evaluate the corrosion resistance of different roughness surface of the titanium after different surface treatment. Methods: Thirty-three pure titanium specimens were cast and divided into three groups randomly, and then were treated by sandblasting, anodic oxidation and mechanical polishing separately. SEM was thereafter used to observed the surface of titanium after modification. Open circle potential and anode polarization curve were determined in acid artificial saliva containing fluoride. Results: SEM results showed that the surface of titanium after sandblasting exhibited micro-topographical massive deep scratches and pits of irregular shape, different size and sharp edge. But on the anodic oxidation surface nanotopographic, 80 nm-diameter nanotubes were formed. The surface of titanium after mechanical polishing had micro-topographic shallow scratches. In the acid artificial saliva，the corrosion potentials of three groups were in the sequence of anodic oxidation group>mechanical polished group>sandblasted group. The corrosion currents of three groups were sandblasted group>mechanical polished group>anodic oxidation group. Both data have statistical significance. Conclusions: Different surface modifications changed the topography of the titanium and affected the titanium’s corrosion resistance. The nanotopograhpy of titanium achieved by anodic oxidation had better corrosion resistance and sandblasting reduced the corrosion resistance of titanium