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Today, smart grid has been widely discussed in worldwide. As advanced metering infrastructure is one of main technologies of smart grid, its structure and functions of each component is represented. In terms of basic features of smart grid, some key capabilities that advanced metering infrastructure should possess are analyzed, and its impacts on power grid networks as well. Combining current research situation of power utility information acquisition system in china, this paper provides reference for building smart grid of user side on the basis of these preliminary analyses.