Different nanotextured titanium surfaces were created by controlling the exposure time and temperature of titanium in a mixture of H2O2 and H2SO4. The field emission scanning electron microscopy (FE-SEM), atomic force microscope (AFM) and contact angle measurement were used to study the characteristics and mechanism of the construction of nanotextured titanium surfaces. Bioactivity was investigated by immersing the samples in a simulated body fluid (SBF) for 7 d. Results show that the difference of the nanotopographies is attributed to the increase of the concentration of H+, which speeds up the dissolution of porous titania gel and a bone-like apatite could be formed on the surface created by chemical oxidation. The method in this paper can be developed to be an intelligent nanotechnology for nano-functionalization of titanium.