Abstract: The complexes of rare earth elements (except Pm) and 1-phenyl-3-methyl-4-heptaflurobutyryl-pyrazolone-5 have been prepared in solid state and characterized by elemental analysis,infrared and ultraviolet spectra, as well as thermogravimetric (TG) and differential thermal analysis (DTA). Their composition is LnA³·HA (LnA³ for Lu). Besides, the possibility of some other solid complex compounds has also been tried as a shift reagent in nuclear magnetic resonance spectrum.