Abstract: Binary and ternary complexes were synthesized by the method of ethanolicwater precipitation，where，Eu³ is the central ion，B-diketones(HTTA=a-thenoytrifluoroacetone，HDBM=dibenzoylmetksne，BA=benzoylaeetone)and aromatic acids are the main ligands，organic ammonium (Phen=phenanthroline，TOA= ri-n-octylamine，TEA=triethylamine)is the second ligand．Optical and thermal properties were studied with fluorescence spectra and TG-DTA analysis．The results show that the fluorescencent intensity of Eu(TTA)₃。Phen and Eu(DBM)₃·Phen are higher than that of CK，and the order is Eu(TTA)₃·Phen>Eu(DBM)₃·Phen>CK．The volatilize temperatures of Eu(TTA)₃·Phen and Eu(DBM)₃·Phen are 220℃ and 250℃ ，higher than the processing temperatureof the film．So it can sarisfy the need of its production．Besides，Eu(DBM)₃·Phen is cheaper than CK and Eu(TTA)₃·Phen，SO the former is competitive than the latter in the market．