We　selected　grey　correlation　and　stepwise　discriminant　analyses　as　basic　models,　proposed　a　coupling　discrimination　method,　and　designed　and　established　a　coupling　discriminant　model　of　the　foundation　subsidence　in　soft　soil　areas　to　address　the　challenges　in　the　discriminant　analysis　of　the　seismic　subsidence　grade　of　soft　soil.　In　this　model,　samples　for　discrimination　and　reference　samples　were　first　analysed　by　indicator　relations　analysis.　Seismic　subsidence　grades　were　ranked　according　to　the　correlation,　and　discriminant　grades　were　screened.　Finally,　the　seismic　subsidence　grades　of　the　samples　that　met　the　criteria　were　confirmed　with　stepwise　discriminant　analysis.　Actual　sample　data　were　calculated,　and　the　discriminant　results　were　compared　and　analysed　with　the　traditional　model　to　verify　the　applicability　and　accuracy　of　the　coupling　model.　We　obtained　good　evaluation　results,　which　provided　a　new　method　for　discriminant　analysis　of　soft　soil　seismic　subsidence　grades.　Copyright　©　2021　Inderscience　Enterprises　Ltd.