The traditional methods of emergency control after large-scale disturbance in power system and the problems to be resolved are introduced. Facing the unperfect control performance resulting from the too complicated calculating methods and too long calculating periods for most of the load emergency control measures， the hierarchical load emergency control is presented. In this method， the controllable nodes of load/generator are picked out and the control strategy table for hierarchical load control is created and performed according to the electrical proximity to the fault node. At the same time， based on the principle of power balance protection， while there appears disturbance of exchange power or large-scale power unbalance， the fast hierarchical load control of load/generator must be adopted with method of load emergency control for avoiding the chain reaction of power system.