Aiming　at　the　overwintering　deep　foundation　pit　in　the　seasonally　frozen　soil　area,　the　abnormal　deformation　of　support　structure　caused　by　frost　heave　of　soil　was　analyzed.　Based　on　the　deep　foundation　pit　of　a　station　in　Harbin　Metro　Line　3,　a　three-dimensional　finite　element　model　of　foundation　pit　was　established.　The　whole　construction　process　of　foundation　pit　excavation　was　simulated,　and　the　rationality　of　the　model　was　verified　by　the　actual　monitoring　data.　The　relationship　between　the　frost　heave　and　the　temperature　field　of　the　soil　was　found　by　using　the　developed　ABAQUS　with　FORTRAN　language.　The　frost　heave　deformation　of　soil,　the　displacement　of　the　retaining　structure　and　the　axial　force　change　of　the　internal　support　were　simulated　in　the　process　of　deep　foundation　pit　overwintering　due　to　the　change　of　temperature.　Amethod　was　proposed　to　control　the　frost　heave　of　soil　by　installing　thermal　insulation　board　on　the　side　wall　of　foundation　pit.　By　analyzing　the　influence　of　different　thickness　of　fire　resistant　XPS　board　on　the　thermal　insulation　effect　of　foundation　pit,　the　economic　thickness　of　the　insulation　board　was　given,　which　can　provide　reference　for　similar　projects　in　the　future.　©　2018,　Editorial　Office　of　China　Civil　Engineering　Journal.　All　right　reserved.