In　order　to　reduce　the　complexity　of　CIS　structure　design,　which　is　caused　by　the　distribution,　expansibility　and　reusing　of　information　system　in　modern　enterprises　and　especially　to　solve　the　problem　of　data　sharing　and　mutual　operation　in　heterogeneous　database,　middleware　technique　has　been　applied　to　simplify　the　development　of　information　system.　By　analysis　of　the　needs　of　CIS　and　the　introduction　of　middleware,　a　design　plan　which　is　bases　on　J2EE　middleware　technology　CIS　system　structure　is　described　by　this　paper.　Especially　heterogeneous　conditions　coexistence　regarding　the　non-structural　database　and　the　structural　database,　through　the　design　based　on　the　Java　technology　of　middleware　model,　has　been　implemented　the　heterogeneous　database　inter-operation.