Burial　depth　is　a　crucial　factor　affecting　the　forces　and　deformation　of　tunnels　during　earthquakes.　One　key　issue　is　a　lack　of　understanding　of　the　effect　of　a　change　in　the　buried　depth　of　a　single-side　tunnel　on　the　seismic　response　of　a　double-tunnel　system.　In　this　study,　shaking　table　tests　were　designed　and　performed　based　on　a　tunnel　under　construction　in　Dalian,　China.　Numerical　models　were　established　using　the　equivalent　linear　method　combined　with　ABAQUS　finite　element　software　to　analyze　the　seismic　response　of　the　interacting　system.　The　results　showed　that　the　amplification　coefficient　of　the　soil　acceleration　did　not　change　evidently　with　the　burial　depth　of　the　new　tunnel　but　decreased　as　the　seismic　amplitude　increased.　In　addition,　the　existing　tunnel　acceleration,　earth　pressure,　and　internal　force　were　hardly　affected　by　the　change　in　the　burial　depth;　for　the　new　tunnel,　the　acceleration　and　internal　force　decreased　as　the　burial　depth　increased,　while　the　earth　pressure　increased.　This　shows　that　the　earth　pressure　distribution　in　a　double-tunnel　system　is　relatively　complex　and　mainly　concentrated　on　the　arch　spandrel　and　arch　springing　of　the　relative　area.　Overall,　when　the　horizontal　clearance　between　the　center　of　the　two　tunnels　was　more　than　twice　the　sum　of　the　radius　of　the　outer　edges　of　the　two　tunnels,　the　change　in　the　burial　depth　of　the　new　tunnel　had　little　effect　on　the　existing　one,　and　the　tunnel　structure　was　deemed　safe.　These　results　provide　a　preliminary　understanding　and　reference　for　the　seismic　performance　of　a　double-tunnel　system.