The present situation of oil country tubular goods( OCTG),titanium alloy microstructure and mechanical properties were reviewd,corrosion resisting property of titanium alloy as OCTG,influence factors and corrosion resistant mechanism were focused on,and the first-principles calculation in the composition design of the titanium alloy OCTG and the application of the interface corrosion characteristics were introduced. It is found that titanium alloy OCTG has strong resistance to sulfide stress cracking( SSC),the very low corrosion rate under the working conditions of high temperature and high pressure( HTHP) oil and gas field,and the strong resistance to pitting corrosion,crevice corrosion,contact corrosion and hydrogen embrittlement. The passivation film on Ti-6 Al-4 V( TC4) titanium alloy is more likely to be damaged in H_2S corrosion environment,the stability of titanium passivation film will change due to temperature change and other elements intervention,and then corrosion resistance will be different accordingly.