Abstract: To increase the localization degree of maintenance technologies and parts and achieve the sustainability of gas turbines maintenance, the main maintenance technologies of gas turbines were introduced, such as technologies for the decomposition and assembly, cleaning, testing, welding, finishing, coating and commissioning of parts. The research progress of overseas advanced maintenance technologies was presented. The maintenance mode adopted for heavy-duty gas turbines and aircraft engines and their localization degree were investigated, and then, as for the status of gas turbine maintenance localization at PetroChina, it was proposed to learn from the experience of introducing heavy-duty gas turbines and aircraft engines technologies. It was recommended to follow the principle of "from cold to hot, and from outside to inside" to perform localization of two-type gas turbine maintenance technologies and parts based on the orders (from top to bottom) of maintenance rate or scrap rate of parts. Finally, the maintenance localization of gas turbines was prospected by combining with national and local policies.