Many trinary lanthanide complexes have been studied. However, few mixed anion complexes with bidentate heterocyclic amines were synthesized. Mixed anion complexes [Ln (CH2=C(CH3)-COO)2(NO3)(phen)]2 was synthesized and its properties were determined by elemental analyses, IR and TGA. The IR spectra analysis indicate that NO3- , CH2=C(CH3)-COO- and Phen are coordinated with Ln. And the fluorescent spectra of [Eu(CH2=C(CH3)-COO)2(NO3)(phen)]2 and 1H NMR spectra of [La(CH2=C(CH3)-COO)2 (NO3)(phen)]2 was determined respectively. However, few trinary lanthanide complexes have been studied. Mixed anion complexes [Ln (CH2 = C (CH3) -COO) 2 (NO3) (phen)] 2 was synthesized and its properties The determined elemental analyzes by IR and TGA. The IR spectra analysis indicate that NO3-, CH2 = C (CH3) -COO- and Phen are coordinated with Ln. And the fluorescent spectra of [Eu (CH2 = C (NO3) (phen)] 2 and 1H NMR spectra of [La (CH2 = C (CH3) -COO) 2 (NO3)