In　view　of　the　project　of　newly-built　metro　tunnel　upcrossing　the　existing　tunnel,　and　based　on　the　analytical　solution　to　the　unloading　additional　stress　induced　by　the　excavation　of　the　newly-built　metro　tunnel,　the　elastic　foundation　beam　model　of　the　existing　tunnel　structure　was　established　and　the　expression　for　predicting　the　upheaval　deformation　of　the　existing　tunnel　structure　was　obtained.　The　expression　was　applied　to　predict　the　upheaval　deformation　of　the　tunnel　structure　of　the　existing　Metro　Line　1　in　Beijing　induced　by　the　upcrossing　project　of　Xidan　Station　of　Metro　Line　4.　The　influence　of　soil　foundation　coefficient　and　unloading　parameter　on　the　upheaval　deformation　of　the　existing　metro　tunnel　structure　was　analyzed.　The　results　show　that　the　shape　of　the　calculated　upheaval　deformation　curve　of　the　existing　tunnel　structure　exhibits　single　peak　and　follows　approximately　normal　distribution.　The　upheaval　deformation　can　be　reduced　obviously　by　improving　soil　foundation　coefficient.　The　upheaval　deformation　of　the　existing　tunnel　increases　continuously　with　the　continuous　increase　of　the　unloading　width.　But　it　has　little　effect　on　the　upheaval　deformation　when　the　unloading　width　is　greater　than　30　m.　The　upheaval　curves　of　the　existing　tunnel　show　different　shapes　with　the　gradual　increase　in　the　distance　between　the　double　unloading　rectangles,　namely,　single　peak　pattern　follows　basically　normal　distribution,　the　intermediate　section　is　straight　line　and　two　sides　are　similar　to　normal　distribution,　and　double　peak　pattern　follows　approximately　normal　distribution　due　to　the　superposition　of　two　curves.