This　paper　presented　a　dynamic　road　network　traffic　flow　simulation　model.　This　model　first　uses　gravity-based　O-D　estimation　method　to　calculate　the　travel　demand　matrix　of　different　sub　regions.　Second,　this　paper　constructs　a　road　network　model　on　the　basis　of　complex　network　and　link　resistance　model　to　connect　different　traffic　sub-zones.　In　addition,　on　the　assumption　that　reasonable　people　usually　choose　the　shortest　path　with　minimum　link　resistance　as　their　travel　path,　a　mapping　algorithm　from　travel　demand　to　volume　of　traffic　flow　is　introduced　in　our　model.　On　the　basis　of　the　discrete-event　simulation　method,　a　simulation　prototype　system　on　PC　is　implemented.　Experimental　results　show　that　this　simulation　system　can　simulate　the　dynamic　evolution　of　travel　demand　and　traffic　flow　in　real　time　way　and　the　model　is　effective.