The　management　and　operation　of　a　modern　enterprise　demands　its　EIS　should　have　the　characteristics　of　distributive,　expansible　and　reusable.　It　causes　the　complication　of　structure　designation　of　EIS　and　the　prominence　of　interoperability　and　data　sharing　among　the　heterogeneous　systems.　Middleware　technique　simplifies　the　development　of　EIS　by　its　own　structure　characteristic　and　effectively　solves　the　problem　of　interoperability　of　system.　In　this　paper,　the　requirement　of　EIS　is　analyzed　and　the　middleware　is　introduced　firstly.　Then　EIS　structure　based　on　J2EE　middleware　technique　is　designed.　Finally,　an　accessing　middleware　model　based　on　Java　technique　is　designed　and　interoperability　is　realized　in　heterogeneous　database　environment.　©　2008　IEEE.