Abstract: The heterogeneous data integration architecture of this paper includes fours level: source schema level, local schema level, global schema level, user schema level. We use Web service interface to complete the transformation from the source schema level to the local schema level. We implement the transformation from the local schema level to the global schema level using the mergence of different local schemas and the solution of confliction. The user schema level which can adjust according to the real-time situation dynamically is a subset of global schema level. We also define a XML based uniform data model to support the querying in the integration of heterogeneous data, and propose a query disposal process for the system.