Abstract: The lack of coordination between FACTS control and conventional control may threaten the security and stability of power grid. Without taking FACTS into consideration, the off-line control strategy is too conservative and the emergency control measures are heavy. Meanwhile, if the capacity of FACTS equipment is fully used in the transient process, the section limit will be so optimistic that the emergency control measures may be insufficient. A transient stability emergency control strategy is proposed with consideration of FACTS, which divides the FACTS participated transient stability control into three stages, including FACTS equipment active control, emergency execution correction strategy and in-turn additional control. With the combination of the conventional transient stability control and FACTS control, the system safety is ensured and the economic efficiency of the control measures is improved. The proposed strategy is verified by simulation of a practical power grid. The simulation results show that the participation of the FACTS in the power grid transient stability control can decrease the acceleration energy of the transient process and reduce the cutting-off number of generators while maintaining the stability of the power grid.