A　series　of　stress　path　tests　on　typical　soft　soils　(silt　and　organic　silty　clay)　in　the　influence　range　of　foundation　pit　in　Fuzhou　city　were　conducted　by　using　triaxial　apparatus　with　stress　and　strain　control　in　order　to　research　the　stress-strain　behaviours　of　unloading　and　loading　caused　by　excavation　and　retaining　structure　of　foundation　pit.　Compared　with　the　results　of　triaxial　tests　between　normal　consolidation　and　K0　consolidation　samples　in　the　same　confining　pressure,　it　is　indicated　that　there　are　large　differences　in　deformation　and　strength.　Based　on　the　results　of　K0consolidated　triaxial　tests,　Duncan-Chang　parameters　were　figured　out　and　the　methods　of　certification　of　each　parameter　in　the　model　were　put　forward.　At　the　same　time,　comparison　with　model　parameters　obtained　by　normal　consolidation　samples　showed　that　some　parameters　had　significant　difference;　and　they　decided　the　difference　of　stress-strain　relationship.　Duncan-Chang　model　parameters　were　suggested　to　obtained　through　triaxial　loading　and　unloading　test　by　K0　consolidation　samples　for　the　sake　of　satisfying　numerical　simulation　analysis　of　foundation　pit　engineering.　Duncan-Chang　parameters　of　typical　soft　soils　offered　by　the　tests　can　be　referred　to　numerical　simulation　of　foundation　pit　engineering　in　Fuzhou　city　or　other　similar　strata　sites.