The　smoke　diffusion　characteristics　in　an　asymmetric　V-shaped　tunnel　located　at　the　slope　change　point　were　studied　by　experiments　in　a　1/20　small-scale　tunnel.　The　influences　of　the　slope　composition　of　the　V-shaped　tunnel　and　fire　heat　release　rate　(fire　HRR)　on　the　fire-induced　airflow　velocity　in　the　tunnel　and　maximum　ceiling　temperature　rise　were　the　focuses.　The　results　show　that　due　to　the　height　difference　between　the　two　ports　of　the　asymmetric　tunnel,　the　resulting　thermal　pressure　difference　between　the　two　sides　of　the　tunnel　drives　the　smoke　to　flow　toward　the　large　slope　side　and　the　inlet-induced　airflow　velocity　increases　with　the　increases　in　the　slope　difference　and　the　HRR.　The　dimensionless　inlet-induced　airflow　velocity　v*　is　proportional　to　phi　10.525H*0.634　phi　1-0.223Q*0.288.　The　maximum　ceiling　temperature　rise　increases　with　the　increase　in　the　HRR　and　decreases　with　the　slope　differences　between　the　two　side　tunnels.　An　empirical　model　of　the　dimensionless　induced　airflow　speed　and　the　maximum　temperature　rise　was　proposed.