Based　on　the　foundation　pit　of　light　rail　transfer　station　in　a　city,　through　field　monitoring,　the　variations　of　horizontal　displacement　of　supporting　pile,　horizontal　displacement　of　pile　top,　and　axial　force　of　steel　brace　are　analyzed　under　asymmetric　loads　on　two　sides　of　deep　foundation　pit;　and　the　influences　of　foundation　pit　excavation　on　surrounding　buildings　are　also　analyzed.　Deformation　law　of　supporting　structure　is　obtained　so　as　to　provide　experience　and　guidance　for　similar　engineering　design　and　construction.　The　results　show　that　the　effect　of　asymmetric　load　on　asymmetric　deformation　caused　by　horizontal　displacements　of　supporting　pile　and　pile　top　is　obvious.　When　one　side　supporting　piles　still　have　higher　safety　factors,　the　other　side　supporting　piles　exceed　the　limit　value　already.　Excavation　of　foundation　pit　induces　different　settlements　for　the　buildings　on　the　two　sides.　Supporting　effect　of　steel　brace　becomes　weak　due　to　the　asymmetric　deformation　of　supporting　pile.