Ground　settlement　and　tunnel　stability　problem　caused　by　tunnel　excavation　are　two　key　problems　of　subway　tunnel　construction.　Based　on　the　background　of　ShenYang　subway　No.1　Line,　according　to　geological　data,　three　dimension　numerical　model　of　tunnel　excavation　is　established.　To　study　soil　settlement　with　excavation　process　more　exactly,　shotcrete　and　concrete　liner　are　studied　respectively.　The　relationship　between　soil　settlement　and　excavation　process　by　using　different　support　thickness　is　established.