Pile　anchor　supporting　structure　is　a　common　method　in　deep　foundation　pit　engineering.　To　a　certain　extent,　anchor　forces　can　reflect　the　earth　pressure　acting　on　the　supporting　structures.　In　the　process　of　the　deep　foundation　pit　construction,　the　layers　with　different　types　of　groundwater　are　often　encountered.　Improper　control　of　groundwater　may　lead　to　engineering　safety　problems　and　many　other　cases　which　can　cause　bad　effects　on　the　surrounding　environment.　Therefore,　it　is　of　practical　significance　to　conduct　the　optimal　designs　for　supporting　structures　of　deep　foundation　pit　by　monitoring　the　anchor　forces　in-situ.　Through　studying　and　analyzing　the　monitoring　data,　the　earth　pressure＇s　magnitude　and　distribution　law　can　be　further　understood.　In　this　paper,　foundation　pit　engineering　is　taken　as　a　base,　a　whole　monitoring　of　the　actual　anchor　forces　is　made　in　the　process　of　tensioning,　locking　and　working　of　anchors,　and　the　monitoring　data　is　analyzed.　A　numerical　analysis　based　on　the　fluid-solid　coupling　theory　of　unsaturated　soil　is　performed,　and　tests　of　the　soil　water　characteristic　curve　(SWCC)　for　typical　unsaturated　soil　are　carried　out.　Finally,　the　test　results　are　applied　to　numerical　analysis.　The　results　of　anchor　forces　calculated　by　considering　the　coupled　condition　and　ignoring　the　groundwater＇s　effect　are　compared　with　the　monitoring　results　of　engineering　site.　The　comparison　indicates　that　numerical　results　are　inconsistent　with　measured　results.　The　numerical　results　are　close　to　the　measured　results　only　when　the　fluid-solid　coupling　theory　of　unsaturated　soil　is　considered.