This paper proposes a XML-based power heterogeneous data integrating framework. The tool uses XML to describe and model the objects of power system in a similar way with rational database. It helps transform the heterogeneous data belonging to different power organizations to the data with uniform format stored as XML files. The tool can enable the heterogeneous data integrating and exchanging of power system. Thus various distributed application can be developed base on this framework. The practical application proved the efficiency of proposed framework.