Filler　defects　and　matrix　crosslinking　degree　are　the　main　factors　affecting　the　interfacial　adhesion　properties　of　propellants.　Improving　adhesion　can　significantly　enhance　debonding　resistance.　In　this　study,　all-atom　molecular　dynamics　(MD)　simulations　are　employed　to　investigate　the　interfacial　adsorption　behavior　and　mechanisms　between　ammonium　perchlorate　(AP)　fillers　and　a　poly(3,3-bis-azidomethyl　oxetane)-tetrahydrofuran　(PBT)　matrix.　This　study　focuses　on　matrix　crosslinking　degree　(70-90%),　AP　defects　(width　20-40　&　Aring;),　and　temperature　effects　(200-1000　K)　to　analyze　microscopic　interfacial　adsorption　behavior,　binding　energy,　and　radial　distribution　function　(RDF).　The　simulation　results　indicate　that　higher　crosslinking　of　the　PBT　matrix　enhances　interfacial　adsorption　strength,　but　incomplete　crosslinking　reduces　this　strength.　Defects　on　the　AP　surface　affect　interfacial　adsorption　by　altering　the　contact　area,　and　defects　of　30　&　Aring;　width　can　enhance　adsorption.　The　analysis　of　temperature　effects　on　binding　energy　and　interface　RDF　reveals　that　binding　energy　and　interface　RDF　fluctuate　as　the　temperature　increases.　This　study　provides　a　microscopic　perspective　on　the　PBT　matrix-AP　interfacial　adsorption　mechanism　and　provides　insights　into　the　design　of　PBT　azide　propellant　fuels.