Along　with　the　development　of　international　trade,　traditional　barriers　like　tax　and　limitation　are　gradually　wearing　off　and　Technical　barriers　to　trade　(TBT)　which　care　about　health,　life　and　environment,　are　having　much　heavier　effect　on　international　trade.　Because　of　TBT,　our　export　trade　suffers　great　economic　loss.　In　order　to　defend　TBT　set　by　developed　counties　effectively,　based　on　the　research　achievement　of　one　national　society　and　science　fund　project　and　two　Beijing　natural　science　fund　projects　that　has　been　finished　recently,　this　paper　analyzes　the　theory　of　TBT,　discusses　the　indexes　system　on　early　warning,　summarizes　models　and　methods　on　TBT　early　warning　and　introduces　the　most　critical　technologies　used　in　TBT　early　warning　system.　Also,　it　gives　deeper　suggestions　on　present　research.　©　2010　IEEE.