Objective：To study the effects of surface property and corrosion behavior of pure titanium in a simulated peroxidation microenvironment. Methods：The pure titanium specimens were immersed in different simulated body fluids and divided into Hanks’ balanced salt solution(HBSS)group，HBSS+ bovine serum albumin(BSA)group，HBSS+hydrogen peroxide(H₂O₂)group and HBSS+ BSA+H₂O₂ group. The test samples and soaking solutions after 7 days of immersion were collected，and the titanium surface properties were analyzed by scanning electron microscopy(SEM)and X - ray photoelectron spectroscopy(XPS). An electrochemical potentiostat was used to investigate the corrosion behaviors of pure titanium specimens in different simulated body fluids. The quantities of titanium ion release in soaking solutions of different groups were detected by inductively coupled plasma optical emission spectrometer(ICP - OES). Results：SEM and XPS analysis results demonstrated that the micro - morphology of titanium surface in HBSS + H₂O₂ group changed obviously with significant increases in the contents of titanium and oxygen，whereas there were no remarkable differences in other groups. The Nyquist plots，Bode |Z| diagrams，Bode-phase diagrams and equivalent circuit fitting data obtained by electrochemical test showed that the corrosion resistance of titanium surface oxide film in HBSS+H₂O₂ group was the lowest，followed by HBSS+BSA+ H₂O₂ group，and HBSS+BSA group and HBSS group were the highest. ICP-OES revealed that the release of titanium ions in HBSS+ H₂O₂ group was significantly higher than those in other groups. Conclusion：In the simulated peroxidation microenvironment，H₂O₂ could destroy the oxide film on titanium surface，aggravate the corrosion behavior of titanium and trigger the release of titanium ions. When BSA and H₂O₂ act together，BSA could inhibit the corrosion of titanium surface by H₂O₂.