In　order　to　analyze　the　seismic　performance　of　the　underground　station　structure　under　oblique　incidence　of　ground　motion,　a　3-D　finite　element　model　of　Xinghai　subway　station　which　is　a　double　layer　underground　structure　located　in　Suzhou　was　established.　Based　on　the　model,　the　seismic　responses　of　soil　and　structure　under　different　angles　of　incidence　were　researched.　Then　the　space　effect　of　underground　structures＇　seismic　responses　and　the　irrecoverable　deformation　were　analyzed　systematically.　It　is　found　that　irrecoverable　deformation　generates　in　the　soil　subject　to　earthquake,　which　appears　as　the　settlement　of　the　ground　surface.　And　the　irrecoverable　deformation　is　significantly　affected　by　the　incidence　angle　of　ground　motion.　Moreover,　significant　space　effect　can　be　found　in　the　seismic　response　of　the　underground　structure,　i.　e.,　the　side　columns　have　larger　deformation　in　the　longitudinal　direction,　whereas,　the　inner　lateral　columns　have　larger　deformation　than　the　outside　lateral　columns　in　the　lateral　direction.　Furthermore,　the　middle-columns　are　the　weak　link　due　to　the　longitudinal　discontinuity　and　lack　of　constraints　of　the　surrounding　soils.　The　articulated　middle-columns　are　recommended　in　the　design　of　underground　structure,　because　such　middle-columns　only　bear　the　vertical　loading　rather　than　the　horizontal　shear　loading.　©　2016,　Beijing　University　of　Technology.　All　right　reserved.