In　order　to　consider　spatial　effect　of　excavation　engineering,　Duncan-Chang　nonlinear　elastic　model　and　Mohr-Coulomb　ideal　elastoplastic　model　attained　by　K　0　consolidation　and　normal　consolidation　samples　with　CU　tests　are　adopted;　and　the　whole　3D　finite　element　analysis　of　soft　soil　excavation　engineering　in　Fuzhou　city　using　3D　solid　elements,　shell　elements　and　beam　elements　considering　contact　interactions　is　built　which　applies　ABAQUS　software.　The　response　of　the　whole　system　during　the　construction　of　the　foundation　pit　is　done　by　numerical　simulation　＂object　tests＂;　and　it　is　compared　with　the　field　measurements　and　2D　numerical　simulation　results.　It　is　shown　that　compared　with　Mohr-Coulomb　ideal　elastoplastic　model　and　2D　results,　the　results　from　3D　numerical　simulation　analysis　using　Duncan-Chang　constitutive　model　parameters　attained　by　K　0　consolidation　samples　with　CU　tests　are　more　reliable.　It　has　distinct　advantages　and　possesses　of　tremendous　popularization　and　application　value.