At present, with the rapidly development of Distributed Energy, large amounts of DG systems lead to the distribution network becoming more complex. But there are many problems in the traditional distribution network, such as weak network structure, low degree of information and automation. As a result, the distribution network faces many challenges, such as Polymorphism distribution, load flow controlling and hard fault location. At the same time as there are some faults such as large volume, high cost ,and so on exit in traditional PMU equipment, that they just can be used in high voltage transmission network ,unable to carry on whole dynamic perception of power grid and can’t meet the demand of the development of Intelligent Substation. In view of the above problems, an implementation scheme of embedded micro PMU device based on ARM FPGA architecture, and QNX Operating system is showed in the paper. It makes PMU become smaller, more flexible to meet the demand of the development of The smart grid and provides an effective means for solving some problems faced in the development of smart grid.