The　combined　dynamic　user　optimal　assignment　and　signal　control　are　studied.　First,　based　on　the　idea　that　traffic　flow　is　assigned　on　the　proper　road-net　by　the　traffic　assignment　and　the　flow　is　adapted　by　the　control　system,　a　Stackelberg　game　model　of　traffic　assignment　and　signal　control　is　proposed.　The　upper-level　of　the　model　is　dynamic　user　optimal　assignment,　and　the　lower-level　is　the　signal　optimization.　Then,　the　discretization　in　time　and　a　simulated　annealing　algorithm　are　used　to　obtain　optimal　strategies.　Finally,　a　simulation　is　carried　on　a　simple　traffic　network　and　numerical　results　demonstrate　the　effectiveness　of　the　proposed　approach.