The　objective　of　this　work　is　to　develop　a　new　process　to　synthesize　LaAlO3　nanopowders　double-doped　by　Sr　and　Mg　with　homogenous　composition.　This　process　combines　the　complexing　ability　of　EDTA　with　the　advantages　of　GNP　combustion　technique　to　overcome　the　shortcomings　of　GNP,　using　EDTA　and　glycine　as　main　complexing　agent　and　main　fuel,　respectively.　The　precursor　and　calcined　powders　are　characterized　by　TG-DSC,　XRD,　TEM/EDS　and　Acoustic　Particle　Size　Analyzer　(APS).　Single　phase　perovskite-type　LaAlO3　solid　solution　is　synthesized　at　750　degrees　C　for　3　h,　which　is　directly　converted　from　amorphous　precursor　powders　without　any　intermediate　phase　formation.　After　calcined　at　1000　degrees　C　for　3　h,　the　median　particle　size　of　La0.90Sr0.1Al0.97Mg0.03O3-delta　(LSAM)　powders　is　about　136　nm　measured　by　APS.　The　maximum　shrinkage　value　of　20.6%　and　relative　density　of　95%　are　obtained　sintered　at　1600　degrees　C　for　5　h　for　1000　degrees　C-calcined　LSAM　powders.　The　total　conductivity　of　7.87　x10(-3)　S　cm(-1)　at　800　degrees　C　for　LSAM　electrolyte　is　measured　by　AC　impedance　spectroscopy　techniques　in　air.　(C)　2012　Elsevier　B.V.　All　rights　reserved.