The　hazards　on　buildings　due　to　terrorist　explosion　attacks　in　recent　decades　are　investigated　and　the　conceptual　design　of　important　buildings　(e.g.　government　office,　commercial　complex,　large　residential　building)　to　mitigate　the　terrorist　explosion　attack　damage　is　proposed.　It　is　emphasized　that　the　conceptual　design　should　begin　with　the　site　selection　and　the　architectural　planning,　and　all　measures　to　mitigate　terrorist　explosion　attack　damage　should　be　considered　in　the　design.　These　measures　include　techniques　such　as　physical　space　planning　to　minimize　the　hazards　of　explosion　on　people　and　property　by　deliberate　planning　of　building　locations,　organization　of　space,　and　other　nonstructural　features.　Planning　engineer,　architectural　engineer,　structural　engineer,　blast　specialist　and　security　consultant　should　collaborate　closely　in　the　conceptual　design.