In this paper,the complex Yb(Gly-Gly) 2Cl 3·3H 2O has been synthesized and its dissociation kinetics has been studied.As a result,first order kinetics mode for the complex dissociation was shown in the medium of pH=2.27 and the dissociation velocity was increased with the temperature rising,but the complex did not dissociate in the medium of pH=2.75,4.00,5.00,6.00.