The　throat　area　is　an　important　part　of　the　metro　traffic　that　connects　the　metro　depot　and　the　mainline　tunnel.　The　throat　area　of　37500　m2　was　conducted　to　investigate　smoke　movement.　The　influence　of　side　wall　height　on　smoke　movement　was　considered　by　combining　the　theoretical　analysis　with　numerical　results.　Six　sidewall　heights　including　0　m,　3　m,　5　m,　7.5　m,　9　m,　10　m　were　designed.　The　sidewall　would　have　a　little　impact　on　free　diffusion　of　smoke　when　the　height　of　the　side　wall　is　lower　than　7.5　m.　Smoke　movement　may　be　affected　by　the　adjacent　wall,　forming　the　phenomenon　of　smoke　accumulation　when　the　side　height　is　7.5　m.　It　should　be　considered　to　expand　the　openness　of　the　side　wall　or　add　mechanical　auxiliary　smoke　exhaust　equipment　in　a　local　position.　This　work　may　provide　an　engineering　reference　value　for　fire　smoke　control　in　the　throat　area　of　the　metro　depot.　©　Published　under　licence　by　IOP　Publishing　Ltd.