Abstract: Described here are the characteristics of the titanium alloy OCTG，and summarized are the elements affecting the corrosion resistance thereof，including pH value， temperature， H₂S content，completion fluid，acid fluid and SSCC testing method， etc. The assay also presents achievements about the researches on mechanical properties and thread connection of the titanium alloy OCTG，and relevant application evaluations as made both at home and abroad. Based on the analysis， conclusions are made as follows. The titanium alloy OCTG features low density，high strength，and excellent corrosion resistance，etc.，and has rather low corrosion rate and fine corrosion resistance under both the simulated gas recovery conditions （high H₂S-CO₂ contents，element of S，stratum water containing high concentration chloride，etc.） and gas field acidification environment. And mechanical properties and thread connection performance are considered as the two critical issues related to R & D of titanium alloy OCTG.