The　green　building　concept　originated　from　the　need　and　desire　for　more　energy　efficient　and　environmentally　friendly　construction　practices.　With　a　boom　in　certified　green　buildings　in　recent　decades,　however,　various　stakeholders　have　raised　concerns　about　the　actual　energy　performance　of　such　buildings.　While　studies　have　shown　significant　gaps　between　the　expected　and　actual　energy　use　of　green　buildings,　the　methods　used　in　the　analyses　have　been　considered　inappropriate.　A　dynamic　approach　has　been　suggested　to　quantify　the　discrepancy　between　the　expected　and　actual　energy　use　in　green　buildings.　However,　although　the　concept　of　the　dynamic　approach　has　been　discussed　in　several　studies,　a　process　and　methods　for　applying　the　approach　in　real　applications　are　not　available　in　the　literature.　This　study　introduces　a　process　and　methods　for　practicing　the　dynamic　approach　and　provides　five　case　studies　of　using　this　approach　to　assess　the　energy　performance　gap　of　green　buildings.　The　analyses　show　that　the　dynamic　performance　gap　of　the　five　buildings　ranges　from　3.0%　to　53.5%,　with　a　median　of　24.7%,　and　the　average　dynamic　gap　of　the　HVAC　system　is　nearly　two　orders　of　magnitude　greater　than　that　of　the　non-HVAC　system.　The　degraded　controls　of　HVAC　systems　may　be　a　main　cause　of　the　performance　gap.