The complex of dysprosium chloride with glycine and L-tyrosine, Dy(Tyr)(Gly) 3 Cl 3 •3H 2 O, was synthesized and characterized. The standard molar formation enthalpy of Dy(Tyr)(Gly) 3 Cl 3 •3H 2 O at T=298.15 K was determined to be ( -4287.10 ± 2.14) kJ/mol. The kinetics of thermal decomposition of the complex was studied by non-isothermal TG-DTG curves. The kinetic parameters and mechanism function of the thermal decomposition reaction for its second step were proposed. The kinetic equation could be expressed as: dα/dT=3.14×10 20 s -1 / βexp(-209.37 kJ•mol -1 /RT)(1-α) 2 .