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Aiming at the information transmission problem of advanced metering infrastructure(AMI) in smart grid, this paper researches the communications scheduling strategy in AMI at a macroscopic view. The AMI system structure and information flow are analyzed, and the power users are classified into several grades by the importance. On the above basis, the defect of conventional scheduling strategy of information transmission is analyzed. In the wide area, an optimized scheduling strategy based on users importance and time critical is proposed to guarantee the important power users' information transmission being handled promptly. The simulation results of the optimized scheduling strategies demonstrate that they can effectively improve the real-time performance and reliability of AMI information transmission.