Abstract: The situation of pilot phase test and test research of Xinjiang power grid is summarized. The limiting conditions for phase advance operation including stator core temperature rise, stator current, terminal voltage and power consumption, and low excitation limit are analyzed. The simulation software is used to simulate the excitation voltage and excitation current, reactive power, active power and power angle of the generator. Finally, some suggestions are put forward for the current phase operation of the Xinjiang power grid generator set.