Data, as an important part of enterprise informatization, have always been in the key position in the process of a large enterprise system implementation. In the background of the nuclear power plant EAM project AS product of the implementation, through refactoring data source model, data mapping between models and views, import application development methods etc, this paper uses efficient, accurate and low-cost solution to solve all sorts of problems in the process of data import. This also has guidance value for large companies such AS ERP software data import.