The voltage control area (VCA) has weak coupling, and correcting the VCA can improve the consistency of voltage changes in the area, thereby optimizing the results of grid partitioning. The traditional partition correction method has problems such as requiring a large amount of calculation and lack of a theoretical basis for PV node merging. Therefore, this paper proposes a method to correct the boundary nodes of the VCA, one which can effectively reduce the calculation for the partition correction. The proposed method uses small element removal to obtain the grid division results under each threshold, and uses the Q-V curve as the criterion to select the quasi-division corresponding to the best threshold in each division result. Based on the weak coupling between regions, the proposed method is used to correct the quasi-partitioning, and the optimized partitioning results are obtained. The proposed method performs disconnection correction on the boundary nodes of the quasi-partition, and uses the average electrical distance to merge the remaining PV nodes after correction. This not only reduces the calculation for the partition correction, but also provides a theoretical basis for the rational allocation of reactive power sources in each area. The effectiveness of the proposed method is verified by simulation analysis of 10 machines and 39 nodes in New England. This work is supported by the Management Science and Technology Project of the Headquarters of State Grid Corporation of China (No. 5108-202135033A-0-0-00).