Abstract: In order to basically improve the minimum break point set（MBPS） to adapt to the non-predictive change level of system structure,a novel scheme of calculating and updating the MBPS for multi-area complex loop network was proposed in this paper.According to static network topology,the MBPSs of sub-area are parallel calculated based on the relay-incidence matrix.Then,the optimization calculation for the MBPS of main-area is calculated and the final MBPS of the whole network is obtained.When the network topology is varied,a single-area MBPS updating algorithm was firstly proposed based on the generalized break point set.Then the method was applied to rapidly update MBPS in the multi-area when the network topology of the sub-area,main-area or single-line connection node is varied.The typical test system with 5-area,68-bus study demonstrates the proposed method has the following advantages.In the aspect of calculating MBPS,this method not only can guarantee the reasonability of the number of break points,but also can accelerate the calculation of MBPS.In the aspect of updating MBPS,this method is able to update the MBPS of the whole network only by dealing with the MBPS of the varied region.Furthermore,the method is adapted to a lot of variation conditions of network topology with less computational burden.