Abstract: In the context of the "dual carbon" goal, in order to promote the low-carbon development of gas turbine power generation industry and achieve large-scale application of hydrogen energy, performance calculation was conducted for a typical F-class gas turbine subjected to hydrogen blending of 0%~65% ratio(volume fraction). The impact of hydrogen blending on gas turbine power, efficiency, exhaust flow rate, exhaust temperature, CO₂ emission, and combined cycle performance was deeply analyzed, with a focus on key technologies for the retrofit of gas turbine combustion system, control system, and auxiliary system. Results show that it is necessary to add hydrogen blending equipment and control device for gas turbine hydrogen power generation transformation. The gas turbine burner, fuel system, combustible gas detection system, fire protection system and hood ventilation system should be upgraded adaptively, and the corresponding control and protection logic such as fuel quantity control, fuel distribution and tempering monitoring should be improved. After the hydrogen blending retrofit, with the increase of hydrogen blending ratio, the output and efficiency of gas turbine and combined cycle increase, and the CO₂ content in exhaust gas is significantly reduced, which improves the carbon emission reduction capacity of the unit.