Based　on　a　deep　foundation　pit　of　metro　in　Beijing,　the　geological　conditions　of　the　proposed　field,　structural　types　and　construction　process　are　introduced.　According　to　the　monitoring　results　in　the　construction　process,　the　variations　of　the　displacement　of　fender　piles,　axial　force　of　the　steel　supports　and　surface　settlement　are　analyzed.　The　results　of　the　numerical　simulation　are　compared　with　those　of　finite　element　software,　and　they　are　almost　consistent.　Through　further　researches,　the　effects　of　pit　size,　embedded　depth　of　the　piles　and　construction　condition　on　the　deformation　rules　of　deep　foundation　pit　are　obtained.　It　can　provide　a　reference　for　the　design　and　construction　of　deep　foundation　pits　under　this　type　of　support.