Evaluation of the decay data of 109Cd

109Cd decays to the excited states of 109Ag through the electron capture decay mode. The evaluation of the complete decay scheme and data of 109Cd including the recent new measurements is presented in this report. The limitation of relative statistical weight method (LRSW) was applied to average numbers throughout the evaluation. The uncertainty assigned to the average value was always greater than or equal to the smallest uncertainty of the values used to calculate the average. The half-life is determined to be 462.0±0.3 days. All known measured absolute emission probabilities for gamma-ray and KX-ray have been examined. And the gamma-ray emission probability of the reference γ line of 88.0336 keV is recommended to be 3.65±0.3%. The internal conversion coefficients and their uncertainties were used to obtain the complete decay intensity balance. The other decay characteristics are calculated using the ENSDF analysis program. Finally the 109Cd decay scheme was given.