This paper presents a loosely coupled data integration solution. It separates the heterogeneous data sources from the data integration system as a service provider, and integrates the heterogeneous data sources into a unified data view called data integration processing package by the bottom-up way using the popular mediator/wrapper approach, and implements a prototype system initially. This paper focuses on the architecture of the system, as well as the structure design and the creation process of the data integration processing package, Finally, verifies the flexibility and validity of this solutions by experiment.