For　problem　of　generating　emergency　alternative　based　on　case-based　reasoning,　an　emergency　case　decision　method　with　considering　the　effectiveness　of　the　alternative　is　developed　from　the　effective　judgment　of　the　alternative　and　fusion　of　the　implement　effect.　According　to　the　forecast　alternative　of　the　decision　maker,　the　effective　case　set　is　generated,　and　the　similarities　between　the　effective　historical　cases　and　the　target　case　are　calculated.　Then,　the　method　of　distance　entropy　is　used　to　fuse　the　effect　of　many　periods　of　alternative　implementation.　Furthermore,　the　overall　evaluation　value　of　each　alternative　is　calculated　by　integrating　the　similarities　and　the　effectiveness,　and　the　desirable　alternative　can　be　determined　according　to　the　obtained　overall　evaluation　value.　Finally,　a　high-rise　building　fire　example　is　used　to　illustrate　the　feasibility　and　effectiveness　of　the　proposed　method.　©　2016,　Editorial　Office　of　Control　and　Decision.　All　right　reserved.