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将REI等值技术应用于求解多区域电力系统的无功优化并行计算问题，对系统各个分区的外部网络进行REI等值化简，并对相角传递、等值网络初值计算、外层协调计算与REI等值网络修正等关键问题提出了具体的解决办法。并以此为基础建立了适合多区域无功优化的并行计算模式，通过采用Matlab并行计算平台实现无功优化并行计算，以IEEE39节点和某695节点实际系统作为算例，通过与集中优化方法和基于Ward等值的多区域无功优化并行算法进行比较，对所提方法的有效性和优缺点进行了详细分析。“,”This paper presents a method of applying REI equivalent technology to give a parallel solution for multi-area power system reactive-power optimization problem. The external systems of each area are simplified with REI equivalent, specific methods for solving key problems in terms of phase angles transfer, equivalent network initial parameters calculation, outer coordination calculation and REI equivalent network correction. Parallel calculation model which is suitable for multi-area reactive power parallel optimization calculation is established. The reactive power optimization parallel calculation is implemented using Matlab parallel computing platform. Testing results on IEEE 39-bus system and a 695-bus practical system show the efficiency, advantages and drawbacks of the proposed method compared to centralized optimization method and the Ward equivalent based parallel calculation algorithm.