An improvement is made to the widely used area partitioning method of voltage control areas（VCA）. Based on the traditional area partitioning method by eliminating small elements， a new idea to get VCA is adopted， using the sum of the PV and QV parts of the Jacobian matrix in Newton Raphson load flow. Then all the different topology changes are ordered according to their effect to the system voltage stability and are used to revise those VCA， from the topology change which has the largest effect to the one that has the least effect， until the partitioning result doesn't change. Thus the final VCA could be applied for the analysis of voltage stability in systems of any network topology. The improved method has been evaluated and validated on the 10-generator， 39-bus New England Test System.