This　paper　proposes　a　decision　analysis　method　based　on　the　problem-solution　relation　of　similar　cases　to　support　the　emergency　alternative　adaptation.　The　overall　similarity　between　the　target　case　and　historical　cases　can　be　calculated　by　adopting　a　hybrid　approach,　it　is　then　integrated　into　the　attributes　of　historical　cases＇　problem　and　solution,　relation　of　historical　cases＇,　we　can　estimate　the　relation　between　the　problem　and　solution　based　on　their　cosine　angle.　The　adaptation　of　the　emergency　alternative　should　take　accout　not　only　on　the　angle　relation　between　the　problem　and　the　solution,　but　also　the　size　of　the　module.　Finally,　a　numerical　example　is　provided　to　illustrate　the　feasibility　and　validity　of　the　proposed　emergency　case　adaptation　method　based　on　the　problem-solution　relation.　©　2016,　Zhejiang　University　Press.　All　right　reserved.