Microwave　ablation　is　used　to　treat　lung　tumors　by　releasing　microwave　magnetic　field　to　produce　high　temperature　of　more　than　60　celcius　in　the　tumor　tissues,　thus　causing　tissue　coagulation,　dehydration　and　necrosis　to　achieve　the　purpose　of　treatment.　However,　the　lack　of　appropriate　power　and　time　parameters　for　microwave　ablation　in　clinical　treatment　of　lung　tumors　leads　to　poor　ablation　or　excessive　ablation.　In　this　paper,　a　two-dimensional　simulation　model　of　microwave　antenna　and　ideal　lung　was　established　to　realize　the　simulation　of　microwave　ablation　process.　Meanwhile,　microwave　ablation　experiments　were　carried　out　in　ex-vivo　porcine　lung　under　different　power　and　time.　The　temperature　distribution　was　obtained　by　thermocouples　and　compared　with　the　simulation　calculation.　Set　60celcius　as　boundary　of　the　ablation　area　and　the　ablation　time　was　360　s.　The　length　of　the　ablation　area　parallel　to　the　antenna　direction　is　longitudinal,　and　the　length　perpendicular　to　the　antenna　direction　is　transverse.　From　the　simulation　results,　with　the　increase　of　ablation　power　(20　W　to　60　W),　the　transverse　diameter　of　ablation　area　increased　from　32.5　mm　to　55.6　mm,　and　the　longitudinal　diameter　increased　from　47.8　mm　to　69.1　mm.　From　the　results　of　ex-vivo　experiments,　with　the　increase　of　ablation　power　(30　W　to　50　W),　the　transverse　diameter　of　ablation　area　increased　from　29.5　mm　to　48.9　mm,　the　longitudinal　diameter　increased　from　41.1　mm　to　66.3　mm,　and　the　maximum　slot　temperature　increased　from　75.6　celcius　to　106.7　celcius.　The　results　of　numerical　simulation　are　slightly　larger　than　those　of　ex-vivo　experiments　under　the　same　parameters.　When　the　average　diameter　of　lung　tumors　is　less　than　40　mm,　30　W　and　40　W　ablation　power　can　be　selected.　The　ablation　time　is　limited　to　360　s.　50　W　ablation　power　can　be　used　to　ablate　the　lesion　quickly　in　a　shorter　time　to　achieve　the　same　purpose.　Although　there　are　differences　between　ex-vivo　and　in　vivo,　the　validity　of　the　lung　model　and　the　influence　of　ablation　parameters　in　the　simulation　are　verified　in　this　paper.　The　ablation　area　under　different　parameters　was　obtained,　which　served　as　a　reference　data　for　clinical　practice.　A　basic　study　was　made　to　consider　the　complex　lung　model　and　the　changes　of　parameters　with　temperature　in　the　future.