According　to　the　problems　in　evaluation　of　regional　foundation　subsidence　in　soft　soil　area,　a　coupling　model　with　a　few　parameters　was　proposed　in　this　paper.　The　valuation　model　was　based　on　conditional　generalized　minimum　variance　method　and　blind　number　theory.　Firstly,　the　most　influential　factors　were　selected　by　conditional　generalized　minimum　variance　method.　Secondly,　the　mathematical　relation　between　key　factors　and　seismic　depression　was　fitted　through　completely　quadratic　regression　method.　Finally,　regional　foundation　settlement　was　given　on　the　basis　of　the　possible　values　and　faith　degree　of　seismic　depression　which　were　calculated　by　blind　number　theory.　Actual　samples　were　evaluated　in　order　to　verify　the　applicability　and　accuracy　of　the　coupled　model　and　excellent　results　were　obtained.　The　model　in　this　paper　provided　a　new　method　for　evaluating　the　regional　foundation　seismic　subsidence.　©　2014　ejge.