Aircraft　accident　due　to　fuel　tank　system　explosion　is　a　vital　factor　of　the　performance　and　reliability　of　aircraft.　Therefore,　The　fuel　tank　of　the　plane　inerting　system　is　developed　in　the　last　decade,　which　is　aim　to　reduce　oxygen　concentration　by　inflating　nitrogen.　However,　if　there　is　no　oxygen　concentration　sensor,　we　don＇t　know　when　to　update　the　nitrogen　in　the　gas　separation　machine.　To　development　of　a　smart　oxygen　concentration　sensor　fit　the　environment　of　the　aircraft　fuel　tank　we　applied　the　tunable　diode　laser　absorption　spectroscopy,TDLAS,and　Fabry-Perot　technique.　TDLAS　could　In-situ,　continuous,　on-line　measure,　Fabry-Perot　could　compensate　temperature　and　pressure　for　TDLAS.　In　this　paper,　we　established　smart　oxygen　concentration　sensor　based　on　SIMULINK,　which　is　a　commonly　used　MATLAB　numerical　simulation　module,　and　the　simulation　experiments　with　the　measurement　of　oxygen　concentration　was　achieved;　we　compared　the　effects　of　different　temperatures　and　pressures　for　the　smart　sensor,　and　proof　the　necessity　of　Fabry-Perot　temperature-pressure　integrated　sensor.　The　experimental　results　showed　that　the　smart　oxygen　concentration　sensor　could　accurately　measure　the　oxygen　concentration　on　different　temperature　and　pressure,　and　could　adapt　to　the　high　temperature　and　high　pressure　environment　of　the　fuel　tank.　What＇s　more,　the　results　could　provide　experimental　basis　of　the　research　and　development　of　TDLAS-based　aircraft　equipment.　©　2020　The　Institution　of　Engineering　and　Technology.