In　response　to　the　heterogeneity　of　decision　information　in　emergency　decision-making,　and　the　decision　information　can　be　expressed　as　exact　numbers,　interval　numbers,　linguistic　terms,　intuitionistic　fuzzy　numbers,　neutrosophic　numbers,　and　trapezoidal　fuzzy　neutrosophic　numbers,　and　considering　the　simple　and　easy　use　of　case-based　reasoning,　an　emergency　decision-making　method　based　on　case-based　reasoning　in　heterogeneous　information　environment　is　proposed.　Firstly,　the　distance　and　similarity　measure　of　heterogeneous　data　are　introduced,　and　the　heterogeneous　information　attribute　weight　is　calculated　based　on　the　deviation　maximization　method.　Then　based　on　the　comprehensive　similarity　measure,　the　case-based　reasoning　method　is　used　to　find　the　historical　case　that　is　the　same　or　similar　to　the　target　case　from　the　case　base,　so　as　to　obtain　an　effective　emergency　plan　and　treatment　measures　for　solving　the　current　emergency.　Finally,　the　feasibility　and　effectiveness　of　the　decision-making　method　are　verified　by　an　emergency　case,　and　the　advantages　of　the　method　are　illustrated　by　comparison　with　other　methods.　©　2020,　Editorial　Office　of　Control　and　Decision.　All　right　reserved.