A europium-lanthanum hetero-nuclear complex with new ligand N, N′-dimethyl-N, N′-diphenyladipamide (MPAA) was prepared. The one dimensional chain structure of [La0.5Eu0.5(MPAA)2(NO3)3] was determined crystallographicaly. The europium ion and lanthanum ion statistically lie at the position of the metal ion with M=1/2(La+Eu). Each Ln3+ ion is nine-coordinated including three bidentate nitrates, three carboxyl groups from three MPAA molecules, in which two MPAA are act as bridge ligand. The intensity of fluorescence of La3+-Eu3+ heteronuclear complex A was obviously higher than that of pure Eu3+ complex B both in solution and in solid state.