It　is　great　significance　for　the　design　and　construction　of　similar　beneath　engineering　to　study　the　multiple　pre-top　bracing　technology　in　the　subway　close-attached　undercrossing　engineering.　In　this　paper,　taking　the　Beijing　10-line　New　Gongzhufen　station　close-attached　undercrossing　the　existing　Subway　Line　1　Station　as　background,　explored　the　application　of　multiple　pre-top　bracing　construction　technology,　and　designed　a　new　kind　of　top　bracing　platform　system,　studied　the　application　of　multiple　pre-top　bracing　construction　technology　in　the　large　span　of　close-attached　undercrossing　engineering.　©　(2014)　Trans　Tech　Publications,　Switzerland.