An　Urban　Traffic　Link　Tunnel　(UTLT)　is　a　novel　type　of　underground　transportation　system　consisting　of　a　main　tunnel　in　a　loop　shape　and　several　linked　tunnels.　It　has　a　higher　level　of　fire　risk　compared　to　other　common　road　tunnels.　In　this　study,　numerical　study　was　conducted　to　investigate　the　smoke　control　strategies　for　a　designed　fire　scenario　in　the　Beijing　Center　Business　District　(CBD)　UTLT.　An　optimal　smoke　control　strategy　was　developed　and　evaluated　using　three　criteria:　critical　velocity,　minimal　smoke　spreading　area　and　available　safe　evacuation　time.　In　developing　the　optimal　smoke　control　strategy,　six　different　smoke　control　strategies　for　the　UTLT　were　evaluated　initially　by　the　criterion　of　critical　velocity,　and　one　of　those　control　strategies　was　chosen　as　the　primary　strategy　by　steady　simulation.　This　strategy　was　then　modified　according　to　the　dynamic　simulated　results　of　smoke　movements　to　satisfy　the　other　two　criteria.　Consequently,　the　optimal　smoke　control　strategy　for　the　UTLT　based　on　the　primary　strategy　was　obtained.　The　transient　distributions　of　the　smoke　spread,　smoke　temperature　and　CO2　concentration,　were　analyzed.　(C)　2010　Elsevier　Ltd.　All　rights　reserved.