The　influence　of　pressure　(0-50　GPa)　on　mechanical　properties　and　thermodynamic　behaviors　of　Al2Si4Sr3　compound　has　been　investigated　by　performing　first-principles　calculations.　It　is　found　that　the　formation　energy　of　Al2Si4Sr3　compound　is　-25.64　kJ/mol　at　0　GPa.　The　results　show　that　Al2Si4Sr3　is　dynamically　and　thermodynamically　stable　under　pressure.　Moreover,　the　calculated　elastic　constants　showed　that　Al2Si4Sr3　possesses　the　maximum　bulk　modulus　of　187.35　GPa　and　the　minimum　microhardness　of　1.588　GPa　at　40　GPa.　In　addition,　it　is　shown　that　the　Debye　temperature　and　minimum　thermal　conductivity　are　increasing　to　651.63　K　and　0.086　Wm-　1K-1　at　45　GPa,　respectively.　The　analysis　of　electronic　structures　revealed　that　the　Si-Sr　and　Al-Sr　in　(010)　plane　can　form　the　ionic　and　covalent　bonds,　respectively,　whereas　Al-Sr　ionic　bonds　turn　to　be　anti-bonding　states　under　pressure.