At present, each department in large enterprises has already setup a large number of databases on Internet. But these databases lack the information sharing each other, forming the detached island of information; therefore enterprise data integration becomes more and more important. This paper presents a data integration and exchange framework under distributed heterogeneous environment based on web services and XML. The detailed functions of the framework are described. The methods are totally implemented in the data integration platform of the housing fund for eliminating isolated information islands.