The corrosion of tubing strings arising from high temperature, high pressure and highly corrosive medium is a great threat and challenge to wellbore integrity of HPHT gas wells at home and abroad. Service environment, production process, loading condition, and corrosion status of HPHT gas wells in Tarim Basin were analyzed. Three major failure forms including acidizing process induced corrosion, chloride ion/H2S/annulus protection fluid induced fluid stress corrosion cracking and crevice corrosion at tubing string ends were emphatically reviewed. Meanwhile, corrosion mechanism and rule were analyzed and concluded according to literature research and field failure cases. Finally, five key research areas are proposed for future study on HPHT gas well tubing string: full-life-cycle based material selection, 15Cr and 17Cr new pipes, acidizing inhibitor for special CRAs, stress corrosion cracking sensitivity in completion fluid, and full-scale tubing corrosion experimental method.