The　Ordered　Escape　Routing　(OER)　problem,　which　is　an　NP-hard　problem,　is　critical　to　PCB　design.　Primary　methods　based　on　integer　linear　programming　(ILP)　work　well　on　small-scale　PCBs　with　fewer　pins.　However,　when　dealing　with　large-scale　instances,　traditional　ILP　strategies　frequently　cause　time　violations　as　the　number　of　variables　increases　due　to　time-consuming　preprocessing.　In　addition,　heuristic　algorithms　have　a　time　advantage　when　dealing　with　specific　problems.　In　this　paper,　We　propose　an　efficient　two-stage　escape　routing　method　that　employs　LP　for　global　routing　and　uses　a　heuristic　algorithm　to　deal　with　the　path　intersection　problem　to　minimize　wiring　length　and　runtime　for　large-scale　PCBs.　We　first　model　the　OER　problem　as　a　min-cost　multi-commodity　flow　problem　and　use　ILP　to　solve　it.　Then,　we　relax　the　non-crossing　constraints　and　transform　the　ILP　model　into　an　LP　model　to　reduce　the　runtime.　we　also　construct　a　crossing　graph　according　to　the　intersection　of　routing　paths　and　propose　a　heuristic　algorithm　to　locate　congestion　quickly.　Finally,　we　reduce　the　local　area　capacity　and　allow　global　automatic　congestion　optimization.　Compared　with　the　state-of-the-art　work,　experimental　results　show　that　our　method　can　reduce　the　routing　time　by　60%　and　handle　larger-scale　PCB　escape　routing　problems.　©　2024