A　new　smoke　control　strategy　using　a　water　mist　screen　was　developed　to　block　horizontal　smoke　movement　in　a　long　narrow　channel.　Experiments　were　conducted　to　investigate　the　properties　of　smoke　blockage　realized　by　the　water　mist　screen,　and　certain　parameters　were　analyzed　to　confirm　its　effectiveness　in　blocking　fire-induced　smoke,　such　as　the　smoke　movement　process,　distribution　of　temperature,　concentrations　of　O2,　CO2,　and　CO,　and　changes　in　visibility.　Experimental　results　show　that　after　the　water　mist　is　activated,　the　downstream　space　environment　is　improved　and　meets　safe　evacuation　requirements.　Additionally,　the　smoke-blocking　effect　of　the　water　mist　screen　is　excellent　in　the　long　narrow　channel.　This　experiment　provides　a　basis　for　designing　smoke　prevention　and　emission　strategies　in　narrow　and　long　channels　(tunnels　or　long　corridors),　which　is　significantly　important　in　enabling　mass　evacuation　and　fire　rescue.　©　2017,　Editorial　Department　of　Journal　of　HEU.　All　right　reserved.