Protectenvironment(环境保护) 　　Theearthscalechangeofclimatehasbroughtanewkindofnaturaldisasterandthedevelopedandcomplicatedcitysystemisholdingalatentriskofexpandingthedamageartificially.Alsopeoplehasbeenspoilingthehealthsincetheimmensequantityofchemicalshavebeenproducedandalreadyusedinpursuitofconvenienceandvarioustoxicsubstanceshavebeenproducedunintentionallyandaccumulatedinenvironment.Therefore,Weneedsomecountermeasuresfromtheviewpointtopreventthecityenvironmentformdisasterandtomanageenvironmentalrisks.Sowewilldevelopandimproveanewriskmanagementsystemandadisasterpreventionsystemtopreserveandcreatethecityenvironmentwherepeoplefeeleasyandsoundintheirlife.