During　the　construction　of　deep　foundation　pits　of　subway,　because　of　the　engineering　geological　conditions　and　environment,　the　deformation　rules　of　the　deep　foundation　pits　greatly　differ.　A　deep　foundation　pit　is　taken　as　an　example.　Based　on　the　actual　monitoring　data　of　the　deformation　of　row　pile　retaining　structures,　the　deformation　rules　of　the　retaining　structures　during　every　construction　stage　of　the　deep　foundation　pit　are　analyzed　by　means　of　numerical　simulations.　The　results　indicate　that　at　the　beginning　of　excavating　the　foundation　pit,　the　curve　of　retaining　piles　linearly　changes.　With　the　excavation　of　foundation　pit　and　the　erection　of　steel　braces,　the　curve　is　in　the　shape　of　bow.　The　maximum　horizontal　displacement　happens　at　the　2/3　depth　of　the　pit.　It　can　provide　the　reference　for　the　optimization　design　and　scientific　construction　of　similar　deep　foundation　pits.