The　variations　of　ambient　temperature　will　lead　to　the　increment　of　axial　force　and　deformation　for　retaining　structures　in　a　foundation　pit,　which　should　not　be　ignored.　Taking　the　pit-in-pit　project　at　Pandun　Station　of　Fuzhou　Metro　Line　6　as　an　example,　this　work　simulated　the　whole　process　of　excavation　and　construction　by　the　software　ABAQUS　and　Duncan-Chang　constitutive　model　with　3D　finite　element　method.　On　this　basis,　the　analysis　results　were　compared　with　the　on-site　monitor　data　to　verify　the　reliability　of　the　model　and　the　material　parameter　values.　In　addition,　the　variation　regularity　of　horizontal　displacement　and　axial　force　of　the　retaining　structure　was　analyzed　with　the　influence　of　seasonal　or　day　and　night　temperature　changes.　The　axial　force　was　linearly　related　to　the　temperature　after　the　completion　of　the　foundation　pit　excavation.　The　change　of　the　axial　force　was　mainly　reflected　in　the　first　support　of　the　inner　or　outer　pit　and　the　whole　retaining　structure　moved　inside　or　outside　of　the　pit.　The　horizontal　displacement　range　of　the　diaphragm　wall　affected　by　the　temperatures　was　mainly　concentrated　above　the　excavation　depth.　The　temperature　effects　caused　by　temperature　changes　in　different　excavation　stages　were　quite　different.　The　most　unfavorable　condition　at　Pandun　Station　occurred　after　the　finish　of　the　last　support,　the　horizontal　displacement　increment　and　the　change　of　the　axial　force　were　the　largest,　and　the　temperature　effect　was　the　most　obvious.　This　research　will　provide　important　theoretical　and　practical　significance　for　similar　projects.　©　2023　Baqiyatallah　University　of　Medical　Sciences.　All　rights　reserved.