Under the mild condition a new ternary rare earth complex Eu(DBM)_2MA·2H_2O DBM: C_6H_5COCHCOC_6H_5; MA: CH_2C(CH_3)COO- was synthesized by the reaction of EuCl_3 with dibenzoylmethane and methacrylate in alcohol. A new bonded copolymer Eu(DBM)_2MA-MMA was prepared by copolymerization of the Eu(DBM)_2MA·2H_2O complex with methyl methacrylate(MMA) monomer using AIBN as an initiator. The composition, structure and fluorescence properties of the complex and copolymer were characterized by means of elemental analysis, complex titration, IR, UV-VIS and fluorescent spectra. The thermal stability, glass temperature and average molecular weight of the copolymer Eu(DBM)_2MA-MMA were determined by TG-DTA, DSC and GPC, respectively. The research results show that both of the ternary rare earth complex and the copolymer can emit strong Eu(Ⅲ) fluorescence at 613 nm. Under the mild condition a new ternary rare earth complex Eu (DBM) _2MA · 2H_2O DBM: C_6H_5COCHCOC_6H_5; MA: CH_2C (CH_3) COO- was synthesized by the reaction of EuCl_3 with dibenzoylmethane and methacrylate in alcohol. A new bonded copolymer Eu ) _2MA-MMA was prepared by copolymerization of the Eu (DBM) _2MA · 2H_2O complex with methyl methacrylate (MMA) monomer using AIBN as an initiator. The composition, structure and fluorescence properties of the complex and copolymer were characterized by means of elemental analysis The thermal stability, glass temperature and average molecular weight of the copolymer Eu (DBM) _2MA-MMA were determined by TG-DTA, DSC and GPC, respectively. The research results show that both of the ternary rare earth complex and the copolymer can emit strong Eu (III) fluorescence at 613 nm.