There　are　concerns　that　the　air　supply　rate　would　increase　in　a　tunnel　with　a　moving　train.　Higher　relative　air　velocity　between　the　train　wall　and　air　caused　by　piston　effect　would　then　give　higher　burning　rates　in　a　tunnel　fire.　In　this　article,　the　effect　of　air　velocity　on　heat　release　rate　in　a　subway　fire　was　studied　in　a　scale　model　tunnel.　Heptane　was　used　as　the　fuel.　Results　showed　that　increasing　the　air　velocity　to　fire　would　increase　the　heat　release　rate.　This　point　should　be　considered　in　designing　fire　safety　management　schemes　in　subways　when　the　train　is　moving　in　tunnels.