In　order　to　achieve　the　goal　of　＂double　carbon＂　in　China,　to　provide　data　support　for　energy　saving　and　emission　reduction　of　foundation　pit　projects,　to　solve　the　problem　of　complicated　and　tedious　process　of　quantifying　greenhouse　gases　in　foundation　pit　projects,　to　improve　the　engineering　quality　of　foundation　pit　projects,　and　to　increase　carbon　emission　as　one　of　the　evaluation　indexes　of　foundation　pit　projects,　this　paper　establishes　a　modular　calculation　method　of　embodied　carbon　emission　for　foundation　pit　projects　based　on　the　whole　life　cycle　theory.　Based　on　the　whole　life　cycle　theory,　this　paper　establishes　a　modular　calculation　method　for　the　embodied　carbon　emission　of　foundation　pit　projects,　considers　the　characteristics　of　＂temporary＂　foundation　pit　projects,　defines　that　the　embodied　carbon　emission　of　foundation　pit　projects　includes　carbon　dioxide　generated　in　the　building　materials　production　stage,　construction　stage　and　transportation　stage,　and　calculates　the　carbon　dioxide　emissions　of　two　open-cut　underground　stations　and　one　open-cut　interval　of　the　western　section　of　Beijing　Railway　Line　11　(Winter　Olympic　Branch　Line).　Carbon　dioxide　emissions　were　calculated　for　three　foundation　pit　projects　in　the　western　section　of　Beijing　Railway　Line　11　(Winter　Olympic　Branch),　and　the　embodied　carbon　emissions　of　foundation　pits　were　analyzed　from　three　levels:　element　level,　module　level　and　phase　level.　Considering　the　influencing　factors　of　excavated　earth　volume,　backfilled　earth　volume　and　number　of　bored　piles,　the　main　influencing　factors　of　embodied　carbon　emissions　of　foundation　pit　projects　were　analyzed.　©　The　Author(s),　under　exclusive　license　to　Springer　Nature　Singapore　Pte　Ltd　2024.