In order to eliminate line overload quickly and avoid chain failures, an emergency control strategy for line overload based on power flow tracing and power sensitivity is proposed. Firstly, the power flow tracing method is used to determine the control node group, and the adjustment amount of the control node group is calculated based on the adjustment rate of the generator. Then, the power sensitivity method is used to judge the power adjustment direction of the control node group. Finally, the corresponding control of the control node group is carried out by the reverse equal adjustment method. The superiority and effectiveness of the combined method of power flow tracing and power sensitivity are verified by IEEE39 and IEEE118 node systems.