A　model　test　of　shield　under-crossing　in　cobble　strata　is　conducted,　based　on　the　self-designed　earth　pressure　balance　(EPB)　shield　platform,　to　analyse　mechanical　response　of　the　existing　tunnel.　The　test　model　includes　two　existing　tunnels,　i.e.,　a　horseshoe　tunnel　and　a　rectangular　tunnel,　which　are　designed　by　taking　the　interval　tunnel　of　Beijing　metro　line　10　as　background.　The　earth　pressure　acting　on　the　existing　tunnel,　longitudinal　strain　of　the　top　plate　and　base　plate　of　the　existing　tunnels,　and　circumferential　strain　in　the　central　cross-section　of　the　existing　tunnels,　are　measured　during　the　shield　under-crossing　process.　Based　on　the　measured　results,　variation　law　of　the　earth　pressure　on　the　existing　tunnels　and　their　deformation　feature　along　the　longitudinal　and　circumferential　direction　during　the　whole　shield　advancing　process　are　revealed.　The　deformation　difference　between　the　horseshoe　tunnel　and　rectangular　tunnel　is　found,　and　the　weak　positions　in　the　two　existing　tunnels　are　pointed　out.