Usually,　the　network　device　firmware　run　and　debug　directly　on　the　development　board.　In　order　to　save　costs　and　improve　test　equipment　to　test　the　efficiency　of　embedded　software　systems.　In　this　paper,　QEMU　open　source　instruction-level　simulation　software　as　hardware　simulation　platform.　However,　because　the　operating　system　kernel　address　contained　in　the　firmware　is　a　direct　mapping,　so　that　the　firmware　can＇t　run　and　debug　directly　in　a　virtual　simulation　environment.　In　this　paper,　represented　by　MIPS　architecture　platform　TP_LINK　router　firmware,　we　propose　an　effective　method　that　MIPS　architecture　kernel　by　self-compiled,　unpack　the　router　firmware,　add　debugger,　repack　make　root　file　system.　Finally,　mounting　the　root　file　system　to　self-compiled　kernel.　Through　experiments,　the　paper　realized　the　network　device　firmware　binary　image　file　to　run　and　dynamically　debug　tracing　object　program.　The　experiment　process　and　the　results　show　that　this　method　is　effective　and　feasible.