In　recent　years,　with　the　rapid　increase　of　urban　subway　lines,　crossing　engineering　has　become　another　complex　problem　of　modern　tunnel　construction　techniques,　and　especially　ultra-short　distance　up-crossing　engineering　has　attracted　wide　attention.　Based　on　the　project　of　the　new　large-span　tunnel　ultra-short　distance　up-crossing　the　existing　shield　tunnel　with　oblique　angle,　deformation　and　mechanical　space-time　effect　of　existing　shield　tunnel　was　carried　out　in　the　present　work,　and　the　micro　deformation　control　techniques　of　the　＂　bench　pile　+　large-diameter　pipe　roof　+　cable＂　combined　bearing-reinforcement　system　was　proposed.　Firstly,　the　key　construction　techniques　in　this　project　were　introduced,　and　the　vertical　deformation　law　of　the　ground　surface,　the　arch　foot　and　the　ballast　bed　of　the　existing　tunnel　was　researched.　Then,　by　comparing　with　the　field　measured　results,　the　accuracy　of　the　numerical　model　was　verified,　and　the　overall　deformation,　internal　forces　and　torsion　behavior　of　the　existing　tunnels　induced　by　the　construction　of　new　tunnel　were　obtained.　Finally,　the　effect　of　technical　measures　to　control　the　deformation　of　the　existing　shield　tunnel　was　analyzed　in　detail.　The　results　showed　that　the　micro　deformation　control　techniques　of　＂　bench　pile　+　large-diameter　pipe　roof　+　cable　＂　proposed　in　this　paper　can　effectively　control　the　deformation　of　existing　shield　tunnel,　which　provides　a　new　deformation　control　system　for　similar　projects.