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There are often multiple heterogeneous information systems running simultaneously in current enterprise. The data sources of these systems are independent and closed of each other, making it difficult to communicate, share and integrate them. With the deepening of informatization applications, the needs of information exchange in enterprise interior, between enterprise and external, has become increasingly strong, so it urgently needs to integrate existing information, and share information. Data integration is achieved through data exchange between tables, mainly settle the problem of data distributional and heterogeneous nature. It is the premise to make the data structure public for integrated application, that is to disclosure the table structure, the relationship between tables, the meaning of coding, and so on. In the informatization process, by integrating the schedule management data of P3 system and project management system, importing/exporting the schedule data of both sides, avoid the problems of duplication of project schedule information input and information inconsistencies, and benefit the managers to make the right decisions quickly and intuitively to the project schedule status in infrastructure construction phase. This paper introduces an interface program developed through nested loop algorithm, and achieves data integration between power plant project schedule management heterogeneous systems.