The physical mixture of nanosized CuC_2O_4-ZnC_2O_452H_2O, as precursors of CuO-ZnO, have been prepared by the one-step solid state reaction method at room temperature. The thermal decomposition processes taking place in the solid state oxalate mixture of nanometer CuC_2O_4-ZnC_2O_452H_2O have been studied in static air using TG, DSC, XRD and TEM techniques. TEM showed that the grain size of the decomposition product is 5-15 nm . The values of the activation energy E_α were determined using the isoconversional procedure of KAS method and the Ozawa method. The most possible mechanism function f(α) of the thermal decompositions of nanosized CuC_2O_4-ZnC_2O_452H_2O are defined using the comparative method, function models of the decomposition of CuC_2O_4 and ZnC_2O_4 follow the same mechanism function “Avrami-Erofeev equation”. The pre-exponential factor A is obtained on the basis of E_α and f(α) , thus the thermal analysis kinetic triplet of the decompositions of nanosized CuC_2O_4-ZnC_2O_452H_2O are determined. The physical mixture of nanosized CuC2O4-ZnC2O445H2O, as precursors of CuO-ZnO, have been prepared by the one-step solid state reaction method at room temperature. The thermal decomposition processes taking place in the solid state oxalate mixture of nanometer CuC2O4-ZnC2O445H2O was studied in static air using TG, DSC, XRD and TEM techniques. TEM showed that the grain size of the decomposition product was 5-15 nm. The values ​​of the activation energy E_α were determined using the isoconversional procedure of KAS method and the Ozawa method. The most possible mechanism function f (α) of the thermal decompositions of nanosized CuC_2O_4-ZnC_2O_452H_2O are defined using the comparative method, the function models of the decomposition of CuC_2O_4 and ZnC_2O_4 follow the same mechanism function “Avrami-Erofeev equation”. The pre -exponential factor A is obtained on the basis of E_α and f (α), thus the thermal analysis kinetic triplet of the decompositions of nanosized CuC_2O _4-ZnC_2O_452H_2O are determined.