In　the　past　two　decades,　perspective　on　system　integration　(SI)　has　changed　greatly.　Several　disciplines　have　done　much　work　on　SI,　and　advance　new　techniques　unceasingly　to　resolve　problems　that　arose　from　distribution,　heterogeneity　and　autonomy.　Studied　several　new　techniques　widely　used　in　SI,　such　as　extended　markup　language　(XML),　CORBA　and　Agent.　We　propose　an　integrated　model　based　on　these　techniques　to　improve　performance　and　apply　it　in　intelligent　building　system　integration.