Using　the　Beijing　Metro　line　7　as　an　example,　a　numerical　model　of　the　closely　overlapping　tunnels　was　established　by　FLAC3D　finite　difference　software　and　the　seismic　response　characteristics　of　the　tunnels　during　a　strong　earthquake　were　studied　by　inputting　Beijing　Hotels　horizontal　earthquake　waves　at　the　model　base.　The　calculations　indicate　that　in　the　closely　overlapping　tunnels,　horizontal　displacement　of　the　uppertunnel　is　greater　than　that　in　the　lower　tunnel,　and　the　maximum　relative　horizontal　displacements　at　the　tunnel　crown　of　both　the　upper　and　lower　layer　were　found　to　be　at　the　middle　overlapping　part.　Additionally,　the　maximum　acceleration　response　of　the　non　-overlapping　part　was　found　at　both　the　upper　tunnel　floor　and　the　lower　tunnel　crown.　Compared　to　the　shallow　-buried　tunnel,　the　horizontal　displacement　and　stress　of　the　upper　layer　has　a　magnifying　effect　to　different　degrees,　and　the　peak　acceleration　is　reduced;　compared　to　the　deep-buried　tunnel,　the　horizontal　displacement　of　the　lower　layer　has　a　magnifying　effect,　while　the　accelerated　speed　and　the　stress　is　reduced　to　different　degrees.