With distributed photovoltaics integrated into county distribution network, the power flow has become more complicated, energy trend has become more complex, traditional voltage controlled challenged. This paper proposes a dynamic partition method based on network structure and partial measurement data. First, the principle of “nearby power supply” is used for initial partitioning; then, adjusting the area of some nodes according to the demand of the reactive power reserve of each area; after that, executing the partition aggregation algorithm to obtain the final dynamic partition; finally, this paper proposes a distributed voltage control strategy considering partitions. The IEEE69 system simulation verifies the effectiveness of the partition method and the voltage control strategy in this paper.