The X-band EPR spectra of Cu+ doped into cadmium formate dihydrate single crystal was studied at 113 °K. The powder spectrum of the same material was studied over the temperature range from 113 to 300 °K The observed values of the g and A hyperfine coupling constants and linewidths were found to be temperature dependent. The temperature dependence of Cu2+ EPR spectrum values were discussed in terms of dynamic Jahn-Teller effect. The tensor elements of g and A were calculated from the polycrystalline samples at various temperature and it is found that the spectrum at 113 °K has given fallowings, g xx=2.108±0.002, g yy=2.085±0.002, g zz=2.431±0.002 and A xx=48±1, A yy=17±1, A zz=11±1 Gauss.