Shafts　play　an　important　role　in　subway　construction.　Some　shafts　will　be　retained　and　used　as　an　important　part　of　the　permanent　subway　structure　after　the　excavation.　More　knowledge　about　the　deformation　mechanism　of　shaft　construction　is　needed　as　it　has　a　great　influence　on　the　safety　of　the　subway　construction.　Based　on　a　shaft　construction　of　Changchun　Metro1,　this　paper　systematically　analyzes　the　impact　of　various　factors　on　the　enclosure　structure　and　its　surrounding　areas　by　examining　a　large　number　of　monitoring　data　obtained　in　real-time　during　the　shaft　construction.　The　results　show　that　the　inverted　side-wall　method　is　appropriate　for　shaft　construction　under　complex　conditions,　as　this　method　of　construction　would　provide　a　good　control　over　the　deformations　of　the　shaft　enclosure　structure　and　the　surrounding　layers.　The　real　time　monitoring　data　show　that　the　ground　settlements　during　shaft　construction　are　greatly　influenced　by　local　loads　and　construction　traffic　applied　on　the　ground　surface;　e.g.,　the　ground　adjacent　to　the　shaft　loaded　with　excavation　muck　piles　settled　significantly　more　than　the　other　side　that　was　less　loaded　or　not　loaded.　In　addition,　rapid　change　of　groundwater　level　during　construction　dewatering　could　also　significantly　impact　the　shaft　structure　and　its　surrounding　environment,　especially　for　the　surrounding　ground　settlement.　The　result　of　this　study　could　provide　some　useful　information　for　the　design　and　construction　of　similar　engineering　structures.　©　2013　American　Society　of　Civil　Engineers.