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During the application of power system security check, a variety of raw data acquired from different sources, including the information of current operation state, day-ahead forecasting and scheduling etc., should be integrated to generate the cross-sections dataset describing the future operation. The original power system modeling information is exported by SCADA/EMS in CIM format. Furthermore, the problem of translating, accessing and integrating data into the proprietary format for the application of power system security check is challenging, especially the problem of integrating data representing day-ahead power system. This paper explores the problem above and discusses solutions to some challenges in data integration. Finally, the generation of data files in the PSS/E format is implemented.