Anewroutetosynthesizenanosizedcrystallineof(La0.67–XGdX)Sr0.33MnO3(X=0.05,0.10,0.15,0.20)perovskite-typecomplexoxidesatcalcinationtemperatureof600-1000°Cusingtheamorphousmolecularalloyasprecursorswasreported.Theprecursorcouldbecompletelydecomposedintocomplexoxideattemperaturebelow500°CaccordingtotheTGAandDTAresults.XRDdemonstratesthatthedecomposedspeciesiscomposedofperovskite-typestructureatcalcinationtemperatureof600°Cfor2h.Theparticlesizethatdependsonthecalcinationtemperatureoftheprecursorisinarangeof30-120nmasdeterminedbytransmissionelectronmicroscopy(TEM).Thismethodiseffectiveandcanbeeasilyquantitativelycontrolledtosynthesizenanosizedperovskite-typecomplexoxides.Themagneticpropertiesof(La0.67–XGdX)Sr0.33MnO3nanocrystallinewerepreliminarystudied.