Based　on　death　radius　classification　method　for　major　hazard　installation,　this　assay　utilize　＂the　principle　of　maximum　danger＂　and　＂the　principle　of　probability　summation＂　as　the　principles　to　calculate　property　losses　and　casualties,　and　use　the　Classification　Standards　of　Major　Hazard　Installation　(exposure　draft)　as　the　standard,　to　classify　the　major　hazard　installation　of　dangerous　chemicals.　Thus,　it　could　take　property　losses　and　casualties　of　surrounding　environment　into　consideration,　which　ensure　the　considered　factors　of　major　hazard　installation　classification　of　dangerous　chemicals　more　comprehensive,　and　ensure　the　classification　results　more　closely　with　the　real　situation.　The　research　result　of　this　essay　would　provide　certain　reference　value　on　major　hazard　installation　assessment　and　classification　of　dangerous　chemicals.