In　this　paper,　the　Beijing　10-line　New　Gongzhufen　station　close-attached　undercrossing　the　existing　Subway　Line　1　Station　is　taken　as　engineering　background,　and　studying　on　the　application　of　the　flat-top　straight　wall　Cross　Diaphragm(CRD)+　multiple　pre-top　bracing　concealed　excavation　construction　method　in　the　large　cross-section　metro　station　closely-attached　undercrossing　the　existing　station.　The　result　shows　that　the　construction　method　can　effectively　control　settlement　of　the　existing　station　and　satisfy　the　3mm　settlement　control　indicators　of　the　bottom　of　the　existing　station.　So　the　construction　method　is　an　applicable　value　in　the　construction　of　the　strictly　close-attached　passing　through　the　existing　buildings.　©　(2014)　Trans　Tech　Publications,　Switzerland.