The　accident　of　fuel　tank　explosion　is　an　important　factor　affecting　aircraft　performance　and　reliability.　Therefore,　the　inerting　system　of　aircraft　fuel　tank　has　been　developed　in　the　past　decades.　The　purpose　is　to　reduce　the　oxygen　concentration　by　filling　the　tank　with　nitrogen.　In　order　to　monitor　the　oxygen　concentration　in　the　tank,　we　use　tunable　diode　laser　absorption　spectroscopy　(IDEAS)　to　measure.　Based　on　the　commonly　used　Matlab　numerical　simulation　module　Simulink,　this　paper　establishes　the　simulation　model　of　intelligent　oxygen　concentration　sensor,　and　carries　out　the　simulation　experiment　of　measuring　oxygen　concentration.　We　compare　the　influence　of　different　temperature　and　pressure　on　the　measurement　results,　and　prove　the　necessity　of　temperature　and　pressure　compensation.　The　experimental　results　show　that　TDLAS　can　obtain　higher　accuracy　by　adopting　the　second　harmonic　detection　method　under　noisy　conditions,　and　can　adapt　to　the　high　temperature　and　high　pressure　environment　of　the　fuel　tank.　In　addition,　the　research　results　can　provide　a　theoretical　basis　for　the　development　of　TDLAS　based　aircraft　equipment.