With the advance of municipal-county integration, in order to simplify management and further improve the efficiency of automatic control, a distributed voltage and reactive power automatic control system is adopted. Based on the monitor right, taking substation as the basic unit, the system divides the whole model into several local models belonging to different monitoring area; using a distributed technology, services are deployed on multiple physically distributed node computers, assigning the local model to the node computer to monitor, calculate and control; soft isolation message bus ensures that the relevant personnel monitor the power grid and maintain the model in their view of the model, transparenting the underlying information. Compared to the original centralized control, system has more flexible architecture, scalable, and higher reliability. Its calculation and control efficiency is improved significantly. It meets the requirements of municipal-county integration.