A new control strategy, namely prevention-correction coordinated control, is presented in this paper. Firstly, the bi-level programming model is used to establish the model of prevention-correction coordinated control. Then, a mixed method of appling the interior-point method into particle swarm optimization algorithm, is presented to solve the above model. Finally, through the comparative simulation on a 6-bus system between the proposed model and the traditional model, it is found that the coordination with the risk of preventive control and corrective control is superior to the traditional scheduling method with security constraints on the aspect of economy and operational risk.