There are many challenges in the voltage and reactive power control because of power flow fluctuation aggravation caused by large-scale renewable energy resources in the control zone.As a primary control objective，the pilot node selection should consider the impact of renewable energy integration.Considering wind farm as intermittence source，the system stochastic operation states could be constructed by combining statistic probability distribution of wind farm output power during peak，middle and valley load period.Following any stochastic disturbance，the pilot node selection should meet the requirement that voltage deviation expectation of all load nodes can be minimized by eliminating voltage deviation of selected pilot node.The feasibility and effectiveness of the method proposed are verified by IEEE9-bus and New England39-bus test system case study.