The　similar　criteria　number　for　establishment　of　the　metro　experiment　system　was　conducted　by　non-dimensional　analysis　from　the　governing　differential　equation　for　smoke　flow.　The　similar　law　for　establishment　of　the　scale　model　was　presented.　The　1/8　multifunctional　experiment　platform　of　the　subway　section　and　station　was　established,　which　consisted　of　the　parts　of　subway　tunnels　and　stations　and　was　used　to　do　comprehensive　study　on　fire　sciences　and　engineering　issues,　such　as　the　quantitative　fire　scenes,　real-time　monitoring　and　early　warning　of　fire,　flow　of　smoke,　distribution　characteristics　of　temperatures　and　smoke　exhaust　ventilation　pattern.　A　series　of　experiments　were　done　on　the　experiment　platform.　The　results　show　the　data　of　the　reduced-scale　model　is　authentic　and　the　movement　law　of　smoke　is　reflected　well.　In　conclusion,　the　experiment　platform　is　of　great　significance　to　theoretical　and　application　research　on　fires　in　the　underground　spaces.