Although　outer　wall　thermal　insulation　technology　is　an　effective　measure　for　building　energy-saving,　the　production　of　thermal　insulation　materials　causes　serious　impacts　on　environment.　In　the　present　investigation　the　resource,　energy　consumption　and　environmental　emission　of　the　two　kinds　of　thermal　insulation　materials　were　analyzed,　from　the　acquisition　of　raw　materials　to　production　process　based　on　Life　Cycle　Assessment　(LCA).　The　result　show　that　life　cycle　energy　consumption　of　rock　wool　board　is　415MJ　per　functional　unit,　proximately　twice　of　EPS　board＇s　(220MJ).　Overall,　environmental　impact　indicators　caused　by　rock　wool　board　is　more　serious　than　EPS.　©　(2014)　Trans　Tech　Publications,　Switzerland.