By　referencing　the　subject　data　storage　idea　in　the　areas　of　data　warehouse　and　service-oriented　analysis　method,　we　proposed　a　two-stage　method　to　create　SOA-based　data　model　including:　(i)　building　a　subject　domain　E-R　data　entities　model,　and　(ii)　building　service　data　model.　We　described　the　data　model　from　the　layered　point　of　view,　where　three　layers　are　physical　data　layer,　data　aggregation　layer　and　cross-organization　services　aggregation　layer.　In　the　development　of　the　Distance　Open　Education　Information　System,　we　used　this　method　to　analyze　and　establish　the　system　data　model.