Earthquake　damage　to　urban　highway　system　can　cause　major　traffic　disruption　which　can　adversely　impact　post-earthquake　emergency　response,　repair,　and　reconstruction　operations,　and　the　economy　of　region　will　be　also　greatly　affected.　In　present　paper,　the　seismic　risk　analysis　of　urban　transportation　networks　is　presented,　which　focuses　on　the　development　of　seismic　risk　analysis　simulation　system　for　urban　transportation　networks.　By　applying　several　numerical　analysis　methods,　seismic　response　simulation　of　components　in　a　highway　system　(e.g.,　bridges,　roadways,　etc.)　is　carried　out.　With　the　aid　of　the　latest　WebGIS　technology,　the　results　of　all　simulations　are　published　to　the　network　so　that　residences　and　government　officials　can　share　a　common　recognition　of　earthquake　hazard　and　disaster.　Moreover,　combined　with　the　city＇s　real-time　traffic　status,　the　system　can　be　used　as　a　command　platform　for　the　post-earthquake　emergency　rescue.　©　2017　American　Society　of　Civil　Engineers.