In　view　of　the　increasing　number　of　parallel　and　overlapping　cases　of　underground　tunnels　and　the　unknown　ground　vibration　law　under　the　coupled　load　of　subway　and　high-speed　railway　trains,　the　authors　established　a　three-dimensional　numerical　analysis　model　of　a　large　diameter　shield　tunnel　under　passing　a　double-line　subway　tunnel,　and　brought　in　a　rigid　train　model　and　a　track　model　based　on　the　existing　operating　train　parameters.　The　Hertz　contact　was　used　to　simulate　the　contact　between　a　moving　train　wheelset　and　a　rail,　the　nonlinear　contact　between　tunnel　and　surrounding　rock　was　simulated　by　penalty　contact　and　hard　contact,　and　the　infinite　half　space　was　simulated　by　using　an　infinite　artificial　boundary.　By　using　the　time　domain　explicit　global　analysis　method,　the　operation　of　the　running　train　in　the　tunnel　was　simulated　and　compared　with　the　measured　ground　acceleration　results,　and　the　time-frequency　characteristics　of　the　vertical　acceleration　under　the　operation　of　single-line　subway　train　and　single-line　high-speed　train,　as　well　as　the　distribution　law　of　the　surface　acceleration　under　complex　operating　conditions　were　analyzed.　The　results　show　that　the　numerical　model　established　in　this　study　can　better　reflect　the　vibration　response　of　the　ground　when　the　subway　train　is　running.　©　2021,　Science　Press.　All　right　reserved.