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With the development of power systems, the scale of grids has become more and more complex. Real-time monitoring and control of the grid are also becoming more and more difficult. GPS-based synchronous Phasor Measurement Unit (PMU) is a new high-precision measuring device, which can measure the bus voltage vector. The use of PMU has made great changes in the power system. However, how to use the PMU measurement data reasonably, is the scholar most concerned about. A new algorithm has been put out based on the high precision of the PMU measurements as the equality constraints to the power system. The experimental results show that the algorithm improved the accuracy of state estimation of power system, there is a strong practical.