Exchanging　data　in　a　standard　format　has　long　been　the　goal　of　e-commerce.　EDI　is　an　useful　technology　for　the　electronic　exchange　of　structured　documents　between　trading　partners.　However,　EDI　is　expensive,　complex　and　difficult　to　implement.　In　contract　to　EDI,　XML,　an　emerging　universal　data　exchange　standard　based　on　the　Internet,　has　many　advantages,　and　is　more　suitable　for　data　exchange　in　c-commerce.　In　this　paper,　we＇ll　give　a　brief　introduction　for　the　XML　and　the　relevant　key　technologies.　Then,　combining　XML　with　the　key　technologies,　we　have　put　forward　a　data　exchange　framework,　which　makes　considerable　improvements　over　the　traditional　data　exchange　model,　for　e-commerce.　Finally,　with　the　framework,　we　have　implemented　an　online　bookshop　based　on　the　Internet,　and　pointed　out　the　further　perfection　for　the　data　exchange　framework.